I found these to funny to pass up sharing with you. Here's a couple of pranks to play on your friends.
Pay a visit to the local dog pound of SPCA, wearing a chef's hat and an apron. Ask to see one of the kittens or puppies that are available for adoption. Pick it up and act as if you're weighing it, then set it down and ask to see one that's "a little more plump."
Tired of looking for that one sock you lost in the laundry?? Pass on your anxieties: Stick the leftover sock in with someone else's washload. Let them look for the missing sock for awhile.
If you have a (clean) aquarium, toss some thin carrot slices into the tank. Later when you have guests over, grab the slices out of the tank and eat them quickly. If you do it quick enough, your victims will assume you're eating goldfish. If you accidently grab a real goldfish, toss it back in, grab the carrot slice, and complain to your victims that the first fish was too small.
Pry the hubcap off a friend's car, drop two or three steel ball bearings inside, and replace the hubcap. Then watch them drive off. The ball bearings will make an enormous racket for a few seconds, until they become held in place by centrifugal force. They'll stay silent until the victim applies the brakes, and then they'll shake loose again.
I really did think some of these were quite cute.