What are you go-to ways to mess with a colleague?

Posted by Petey619@reddit | AskUK | View on Reddit | 198 comments

Stuck in work on a slow Friday with one of my favourite coworkers. I love messing with him when it's slow/boring(he returns the favour) Just this morning I've locked his security pass in the tool vending machine and taped his sports bottle shut. Nothing major, just childish messing from grown adults.. Any suggestions for the afternoon to go quicker?