i love scaring the shit out of people... it's the faces they make when you jump out from around a corner just as they're walking and scream as loud as you can at them...

something similar lol... wait by a bathroom door and just as you hear them walk up to the door and start to unlock it, hit it as hard as you can with an open fist.... alternative is when a guy is at a toilet pissing (i suggest somewhere other then your own house lol) do the same thing in the middle of him pissing... usually they jump and piss everywhere....

i used to do alot of pranking to my grandpa.... lets just say all my influence came from home alone.... he'd walk into his room and a string infront of his bed woudl knock books off onto him, he'd sit down in his chair which would tighten a fishing string around a kethup packet just barely opened, but tacked to the table, thus squirting ketchup all over his lap, while simaltaneously a big ass board from like the back of a mirror (not cardboard but not wood either) would fall on his head... he'd go to walk back out of his room and a towel would swing down on some more string and hit him in the nuts... and that was just part of one day... i did it to him atleast 1,000 days outta my life... it was a hobby of mine.