One that I actualy got to work because the computer at my school are so close together.

Simply switch the keyboard with the person next to you. In my case he didnt notice the wires because of the proximity. They will try some stuff and it will obviously do nothing. Then under the cover of trying to help them open a word pad or word doucment. Return to you computer and type something like "Im sorry dave, I cannot allow you to do that".

worked untill he checked the lead :/


I also got a disk in a magazine that let you make your own error messages and set a timer on how long it takes to show up.

Im sorry but your harddrive has had a fatal error and is being reformatted. (with the only option being ok) was a favourite of mine.