My favorite was the one about getting washed up, called "Clean-O." It went on and on, with a tot calling to various family members to wash this or that so the child would be "nice and clean-o." Singing this song was humorous to me, especially the verse that said, "Brother, O Brother, Come wash my hair!"-- that's probably because my own particular tot was much more likely to have a screaming fit about having her hair washed than to request anyone to come and wash it! So at the time, I had great perverse delight in singing this verse with my 2-year-old.
Here is a delightful rendition of this song, from a youtube video: http://www.youtube.com/watch?v=-WBsdx9-nEI&feature=related&safety_mode=true&persist_safety_mode=1