ok - THIS IS AWFUL, but... my Dad (of all people) taught it to me, he said the pilots used to sing it in the United Airlines cockpits as they crossed country.. :

I'm looking over the balls of Rover
for fleas that I missed before;
one's on the left ball, and ones on the right,
one's way down under, and clear out of sight,
Oh-oh-oh, I'm looking over the balls of Rover for fleas that I missed before, If I don't see them, if I can't find them, then I'll end up with a bite!

really, really.. bad!