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Fun with Grapes - A Case Study


Patrick R. Michaud,


Using only cheap, readily-available equipment, you can create a spectacular lightshow in the comfort of your very own kitchen, providing hours of fun and excitement for your family, friends, and pets!

Ordinary grapes, when properly prepared and microwaved, spark impressively in an extremely entertaining manner.


We have made an important new discovery in the field of culinary entertainment. Properly prepared, the common seedless grape can be made to combust spectacularly when subjected to a short (5-10 second) duration of microwaves. This study was conducted based upon suggestions from dozens of IRC #root participants using locally available funds and equipment.

Materials Required

The following materials were needed for this study:
  • Green grapes (genus Vitis)
  • Microwave-safe plate (Corelle by Corning)
  • Knife (Ekco Stainless Steel)
  • Microwave Oven (Whirlpool Model MT6901XW-0)
  • No parental sponsors (both authors are fortunate to have supporting funds unencumbered by parental restrictions)


  1. The authors carefully cleared the laboratories of all non-essential personnel, especially those persons who might attempt to abort the experiment while the grapes were still in the pre-combustion phase.
  2. Next, the grapes were carefully prepared for proper theatrical effect. The knife was used to carefully slice the grape almost in half, leaving the grape halves attached by the skin. Next, the grapes halves were placed face down in the middle of the microwave safe plate (Figure 1).

    Figure 1. Grape prepared for theatrical effect

  3. Next, the plate with the prepared grapes were placed into the center of the microwave oven and the door carefully shut. The microwave was set to cook at full power for 40 seconds. Finally, after the various recording devices were in place, the start button on the microwave was engaged.

Observed Results

As can be seen from figure 2, the effect of the microwaves on the sliced grapes produced an extremely satisfying flare and associated sparks. The photographic quality of figure 2 is slightly deteriorated due to the poor lighting conditions at the time of the experiment.

Figure 2. Theatrical effect

The sparks began approximately 5 seconds after the microwave was started. Approximately 3-4 seconds after that, the force of the sparks separated the grape halves by approximately 1.5 cm, ending the theatrical effects. At that point the microwave session was aborted to prevent further damage to the microwave and/or grape. The post-combusted grape is shown in figure 3.

Figure 3. Post-theatrics grape.

Discussion and Conclusions

As this report was being prepared, it became evident to the researchers that a mis-communication occurred from the experimental design to the actual conduct of the experiment. The original experimental design called for the grapes to be placed on the plate with the sliced side up, whereas this experiment occurred with the sliced sides placed downward. Further research will be required to determine if the positioning of the grapes significantly affects the theatrical results.

A future experiment calls for the microwaving of multiple grapes simultaneously for increased theatrical effect. For those who wish to forge ahead on this research, the authors suggest separating each grape by a distance of 1.5 cm or more. Note that the authors take no responsibility for any accidents resulting from mis-application of this study. If your microwave blows up and your house catches fire, call the fire department, not us. Our microwave ovens appear to be in good shape after repeated experiments.

The results of this study will greatly enhance the field of culinary entertainment. New pyrotechnic methods have been developed using commonly available grapes and microwave ovens. The results of this study and its derivative works provide fertile ground for new research. The authors are planning to use this research as a basis for experimentation with other species of grape and produce. Results of such study will be made available in future publications.


The authors gratefully acknowledge the operators of IRC and the participants of channel #root, without whom this study would have been left incomplete.

Patrick R. Michaud/

Strawberry Pop-Tart Blow-Torches


Patrick R. Michaud,


Strawberry Pop Tarts may be a cheap and inexpensive source of incendiary devices. Toasters which fail to eject Pop Tarts cause the Pop Tarts to emit flames 10-18 inches in height.


Last year, an article by well-known newspaper columnist Dave Barry noted that Kellogg's Strawberry Pop Tarts (SPTs) could be made to emit flames "like a blow torch" if left in a toaster too long. Given previous work in the field of food-entertainment (see Fun with grapes-A case study.), it was obvious that this was a new frontier that requires further exploration. The present work describes our independent verification and experience with SPT-based combustion.

Materials Used

Only two basic materials are needed to cause SPT-combustion: a (hopefully inexpensive) toaster and some Strawberry Pop Tarts (Figure 1). In this work, the authors used Kellogg's Strawberry Pop Tarts with Real Smucker's Fruit. SPTs can be obtained either with or without frosting; the non-frosted variety were used for this experiment.

Figure 1
Figure 1. Toaster and Strawberry Pop Tarts

In addition to the basic materials, a number of safety-related items were needed to conduct this experiment. First, a suitable location for the experiment was required, it being expected that the kitchen was not the appropriate place for blow-torching SPTs. The author's driveway was chosen as a suitable site. Second, an appropriate means for extinguishing the SPTs would be needed; a research assistant brought along some baking soda for the purpose.

Experiment Preparation

The toaster and SPT both had to be properly prepared for this experiment. In order to guarantee that the SPT would receive sufficient heat to begin combustion, the toaster was set to its highest setting and the lever was jammed in the "down" position using adhesive cellophane. A SPT was removed from the box and its protective packaging and carefully placed into the toaster slot (Figure 2).

Figure 2
Figure 2. Preparation of Toaster and SPT

Next, the toaster and SPT were taken to the driveway, and an extension cord was arranged to provide power to the toaster. At this point, we were ready to begin the experiment.

Figure 3
Figure 3. Toaster Prepared for SPT combustion

The Experiment and Observations

The toaster was plugged in. First the toaster went through a normal "toasting" cycle (approximately 60 seconds), which more than thoroughly cooked the SPT (since the toaster was set to its darkest setting). By this point we could definitely detect a burnt SPT aroma. The toaster then attempted to eject the SPT, but was prevented from doing so by the adhesive cellophane. The toaster then began emitting loud rattling and buzzing noises due to its inability to eject the SPT.

(At this point the researchers became somewhat concerned that the noise from the toaster would wake the neighbors and attract undue attention. However, we decided that we were already committed to the experiment and that the neighbors would be able to sacrifice some sleep in the name of science.)

Soon thereafter, large amounts of smoke began pouring out of the toaster. The researchers noticed that some of the neighbors down the street were beginning to get a little curious, but the experiment proceeded nonetheless. Approximately 40 seconds later, small flames began licking their way out of the toaster. The flames steadily grew larger and larger until reaching a maximum height of about 18 inches above the top of the toaster. Figure 4 presents a time-series collage of the flames emitted from the SPT.

Figure 4
Figure 4. Time Series Photograph of Flaming SPT

As the flames were reaching their maximum height, the toaster abruptly stopped making buzzing noises. We speculate that the flames had by this point shorted the electronics within the toaster. The toaster was quickly disconnected from the primary electrical source to avoid any potential damage to the author's house. At this point, the researchers also realized that the heat could inadvertently melt the adhesive cellophane and cause the flaming SPTs to suddenly eject from the toaster. Unfortunately, this did not occur. The flames continued for several minutes.

At this point there was some slight concern that the flames might take considerable time to diminish. We then enlisted the help of a reluctant research assistant to sprinkle baking soda on the flames. (The reluctance was understandable given the potential for premature SPT ejection described in the above paragraph.) The baking soda quickly extinguished the flames and produced still further smoke (Figure 5a).

Figure 5
Figure 5. Extinguising the SPT

Once the flames were extinguished, the researchers noted an unanticipated problem: what to do with the (now defunct) toaster and the spent SPT. It became obvious that the toaster could not be returned to the author's house due to both a continued potential fire hazard and the smell of burnt strawberries. In addition, it was noted that the toaster was still "too hot to handle," necessitating the use of a nearby garden hose to cool the toaster off. This is illustrated in Figure 5b. Finally it was decided to just leave the toaster by the curb for the sanitation experts to pick up the next morning (Figure 6.)

Figure 6
Figure 6. Toaster Disposal

Summary and Recommendations

In summary, overcooking the SPT did produce a good size flame. The effect was not as pronounced as the researchers had hoped, but was satisfying nonetheless. The research assistant noted that the flames produced did appear to have some color variation. We believe that frosted SPTs may successfully produce even larger torches. Further research in this area is warranted.

We did desire to repeat the experiment with the remaining five SPTs, but we could not do so because there were no more suitable toasters available for further experiments. In the future, we recommend that toasters be sold in six-packs to accomodate important SPT research. Instead, the remaining SPTs were sacrified over the course of the next several days in private, undocumented consumption experiments.


Special thanks to Jennifer "Svetlana" Reckard for her suggestions and proofreading of this work.