What are your (or your child's) favourite kids songs? One song per answer, and vote for the ones you also like (I made this a community wiki).

Similar to this music question, what are fun "You Tube"-type video's your kids love to watch?

Is it just us, or do all parents make up silly songs for their children? If you can remember any of your made-up songs, please answer with the lyrics and an indication of the tune …