I’ll start with one someone did on me, they stuck a lifelike sticker of a famous person on my car passenger window while I was there for lunch and I nearly had a heart attack when I went back to my car and the DC too loved the joke.
I’ve heard of sticking goggly eyes on everything in the fridge which sort of appeals too.
Does anyone have other ideas suitably gentle but fun as we’ve got to the stage of the holidays where a bit of unexpected novelty would amuse me ! Please update with any antics too , no one must be harmed or unduly alarmed (Please)