Yep... IT guys are all the same. I have one of those things too. Isn't thinkgeek.com great?
Our current game of choice is the ID card treasure hunt since our building is access controlled and you can't get in without your ID. If someone leaves theri ID laying around or in their keyboard, then it's off to some place to hide it. Then we leave clues all over which lead them to the card after about 2 hours. We havea very big building.....
The best one was when someone put the ID in one of the rotating vending machines, It cost the guy $2.25 to buy his ID back.