Not at school, but at summer camp: I loved the one to the tune of Did you ever see a Lassie:   One tent would sing out: Did you ever see a butter fly, a butter fly, a butter fly? Did you ever see a butter fly?   Now you tell us one.          Then the wait for one of the other tentfull of kids to sing one back to us. LIke a Pillow slip. a board walk, etc.