Mrs Stevie and I spent a weekend in a hotel recently on account of it being our 27th wedding anniversary. I suggested we mark the Chateau Stevie bathroom mirror with the words "GET OUT" in soap so it would show up when the Stevieling had a shower. We decided that it would be too mean to scare her this way, as she has a very active imagination. We were split over the alternate plan of writing "CLEAN YOUR ROOM" on the mirror though.
Nothing, of course. I'd never do anything to scare her without being there to make it all better afterward (or give her someone to yell at, which amounts to the same thing). I just fake being mean.