A: Who's that old dude in your car, man?
B: The old dude? Wait, what?
A: The old dude who's lying down in your trunk!
B: Holy s--who the hell is that?!
A: I don't know, it's your car, man!
This is one prank most people would want to play...if only they had the resources. For this, you'll need a tent and some other props to prove that you're a legit car wash. Then you'd need someone to play the part of the old man. It sounds like too much work for a simple prank...so we suggest that you live vicariously through prankster Jack Vale instead, who pulled off this prank recently.
He basically has people leave their cars in the guise of getting it washed. When they come back, he then opens the trunk to reveal an old dude lying there with bedding and stuff. The reactions are priceless. But hey, you don't have to believe me. Watch the clip so you can see for yourself. Enjoy!