You are Evil stingy.... and very very funny...
Here is one of mine. I am pretty clever with batch files, and we used to have a file-sharing server at work, so here ishow it goes. I work this guy named Jim. Jim is not the brightest bulb on the tree. To torture him one time, i put a batch filein his startup folder, so it would launch as soon as he logged on to his pc.
The batch was set to do this, copy a particular file from the server onto his desktop, then launch it, then start a shutdown sequence.
The file was Samantha from Big Naturals.com (this woman:

) Having sex with a guy, very loudly.
When the computer rebooted, the file would delete itself and the clip.
So jim comes in to work, and fires up his pc, and starts telling a story about his weekend. (a note, jim likes to listen to really shitty music, loud...:))
About half a minute into the story, we start hearing "Oh yeah, right there..." in a woman's voice coming from his cubical. He stops dead, and stares over at his computer.
The funniest part was when he went to see what it was, he let out a freudian slip. He went "Wow, what was that again?" and tried to get it to replay. No one believed him that it wasnt his (which led them to believe that all of the other porn on the server was his.... Some of it with horses....)
i eventually spilled my guts because i couldnt stop laughing. I did this to him with a different video or picture every day for a week. :)