(a jeff dahlin came to wonderhowto offices... hand delivered 26 written prank ideas.... and a motorized File cabinet from hell.)
pj/jeff. this thing goes 20mph and the pic was taken in my office. too heavy to easily transport. toyota starter motor and big drycell battery.
During a flight on a small size commuter plane, the subject gets up from his seat in a conspicuous manner and goes into the airplane's restroom. He takes a little while, and makes some noise, perhaps yelling 'yes' yes!'. When he exits the restroom, he is sweaty and wearing a shirt that says 'New Member : One Man Mile High Club' inside a screen print of a palm of a hand. For greater effect, the subject can ask a flight attendant for some extra paper towels after he exits the bathroom.