I have got to find one of those for my husband (math prof)!

And I am fortunate that my four-year-old chose to sing a collection of Christmas songs this year, not just Jingle Bells (and even with that, he does "Dashing through the snow . . . "). But when he was into the Wiggles a couple years back, I had trouble getting "Quack, quack, quack, quack, cock-a-doodle-doo" out of my head.