stick a big @ss potato in his exhaust :-D
or pour salt in his engine oil cap :-D
or Take a long, narrow potato (one that will fit well into an exhaust pipe) and drill a hole in it long ways. Then rig a whistle in one end or find one of those long, thin whistles and stick it in the potato hole. Potato goes in the tailpipe. When the victim gets in the car and starts it up they'll wonder where the hell that noise is coming from!
When you know that your victim is going to enter their car pretty soon about five minutes before they enter their car heat up the metal door handle with a lighter, then hide.
Three way call
Program your victim on speed dial, then the number of a unsuspecting second person. Pick up the phone dial the victims on speed dial, then quikly press flash and speed dial the second person then hangup. The two people have no idea who called who, each trying to blame the other.
Glow Stix
Take one of those glow rod things, break it so that it starts to glow. Cut it open and pour the crap inside on something and throw it at someone. Do it at night, it is funny.
Put cooking oil on toilet seats, it will be impossible to stay on. Listen for thuds as people look like klutzes.
Put a couple of drops of visine in someones cereal and they crap like crazy
You can stick popcorn kernals in somebodys muffler and after they drive around for a little bit they will probably be smelling popcorn! If you know of any other good pranks to play then email me using the link at the bottom of the page.