I prank my kids each year. They expect it. Just small ones. Last year I told them I made brownies but when they went to get one they found a bunch of the letter“E”s cut out of brown paper. Brown “E”s lol. (I did have brownies hidden to give them though) One year I made cereal bowls the night before and froze them, and in the morning acted like I’d poured them cereal but gsve them the frozen bowls. I once put green food dye in the hand soap so their hands were dyed green (it came off easily though). Things like that. One year we were in France on April first and they celebrate “Aprils fish day” where you get paper fishes sneakily taped to your back and everything is fish shaped.