Put a big zipp tie on the drive shaft of somebodys car ! ;p-

Sardines under the floormats in a car work great too. When I was in college, I was involved in a prank-war that lasted years.

best prank i ever pulled, i went to the meat processing plant and get a pig head... Eyes and all! I put it in the freezer facing out. It was covered in blood still. It was priceless to see my mother screeming and running through the house. Lol