We used to do this...
When wireless mice first came out. Except they only had two channels, so if more than two people were using them, everyone's equipment quickly becamse useless.
And for a joke, when you were bored, you'd just change the channel on your mouse and move it around a lot and wait for the cries of surprise and annoyance from your colleagues.
Even better were the keyboards. Change the channel, and type something like "This is IT, your account has been suspended for watching too much porn"
Biting the hand that feeds IT
