1. Pull up the online employee database (with photos) and draw funny pictures. And they thought their ID photos made them look bad...
2. Send "motivational" videos from YouTube out to your suffering comrades.
3. Sleep during meetings, but wake up as soon as your name is called for the second time, with hopefully the right answer.
4. Sneak up on co-workers who wear noise cancelling headphones.
5. Swap offices to escape flooding toilets and don't tell co-workers who need stuff from you, where you've moved. Let 'em figure it out.
6. Anonymously quote wisdom from co-workers in your email signature.
7. "Hide" co-workers' belongings in plain site. Wait. Watch. Laugh. Truthfully say you don't have it. Watch them find it on, under or beside their desk...quite unhidden.