[Closed] What do you do to annoy people?

At work to wind up a colleague who was always either exactly on time or 5 minutes late for shift change over:
Hide all the teaspoons
Empty the kettle just before he arrived
Empty the water jug as well

And whilst he was raving about no water for his first cuppa we'd cheerfully walk out the door going "it's all ****ed, no time for a proper handover as your late AGAIN"

This one is a bit childish, at work when my boss is talking I like to add the word 'naked' at the end of each sentence.

So things like, 'could you send me your worksheet for the week...........naked

You get the idea, drives him nuts 😉