While surfing I came across this site that has neat little pranks that you can play on your fellow computer users. These are not nasty but can be fun, the two I downloaded were Kilroy who pops up on the edge of your windows and the snoring mouse. My daughter almost screamed the first time Kilroy popped up and when the mouse started to snore that was funny.She now checks to see if I`ve added any new things. I hope you find a prank to fit your need. By the way these are not mean but more of a joke to make computing more fun.