What a cool idea!! I have one for you...
Back in 1991 when my wife and I were first married we got stuck in a snow storm on the way up to the mountains to attend her brother's wedding. It was Christmas-time and we had our five year old daughter with us, who was impatiently in need of going potty. We kept her amused and ourselves entralled with the thick falling snowflakes around us by playing Herb Albert's "The Bell that Wouldn't Jingle" over and over and over (anything to keep a five year old from focusing on her problem in the back seat...that's all she wanted to hear).
She's 22 now -- and insists on hearing that song every Christmas (without her legs crossed).