I don't know what the policy in your workplace is regarding the modification of office equipment, but I bet that this guy would violate it.

I don't mean to be unkind, because I'm sure he's fun to work with (unless you are in the cubicle right next to him), but you would probably have to lock up all staplers, keyboards, pencil sharpeners and anything else that moves or else risk finding it as part of a coffee machine or photcopier modification.