Switch a few keys on the keyboard. Just pop them off and switch them with the ones next to them.
Vaseline on phone earcup.
Lower the chair.
Add signature to someones email if you can get access to it saying "Hell yes I;m gay and proud of it".
Place wallpaper on computer of pink teddy bears.
Every day, empty his stapler
Put empty beer cans in his trash can.
Turn off the phone ringer, or put volume as low as possible.
If there is a desk clock, move it an hour ahead.
