I was wondering if there are any problems to the banana prank. If I put a banana in the muffler to block the flow, will it cause damage to the engine?? Are there any long term consequences (meaning, will problems show up later)?

 

Dunno for sure about the engine, but you might find a boot print on your face, depending on whom you do it to... be careful.

 

you want a good, slow developing prank. you need 2 things.
super glue and 4 BBs.

unscrew the 4 valve stem caps off the wheels, put a drop of superglue down the the cap, drop in a BB, wait for it to dry. screw them back on. it will slowly slowly slowly leak air out of the tires, and it will drive the owner freakin crazy trying to figure out the trouble

 

Me and a freind did this same kind of thing, depending on the car it will probably just shoot the banana out of the muffler because of presure build up.