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Mine involves a balloon and a vehicle:
Get some small to medium balloons. In the evening before the day, while the cars are all cooled off. Slip balloons over the tail pipes. Pull them up a bit so that they won't slide off as they fill up with exhaust. I think you can see what is going to happen. :)
You can even go around outside your office and do this right before lunch on that day. :)
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