I have, and had let my son do so recently, and he had such a big smile on his face. A week or so later when I asked him what he wanted for breakfast, he replied ice cream, and my reply was no, you need to eat breakfast food, and not ice cream for breakfast. A special treat from time to time doesn't hurt.
We used to have a sorcerer Mickey, but John was almost pushed off the road by a state plow truck and the topper got stuck in the tree branches and came off. We never put one back on.