What are some ways to fuck with people that are harmless?
Be overly specific. “Have a good day!” ❌ “I want you to enjoy the next 24 hours of your life, buddy!” ✅
Constantly get something small but obviously wrong whenever you tell a story about them. Bonus points for messing up the same story in different ways each time, extra bonus points for doing it while they are in the room and sticking to the story.
When they’re talking to you, repeatedly look behind them and at them again. Eventually they will wonder what’s so interesting back there.
My father in law used to do this. He’d look at your ear while he talked to you. Eventually, you’d turn to see what he eat looking at.
I miss him.
Also looking at a spot someone’s cheek. They always end up asking what’s on their face after a while.
