That is too funny. I know where you are coming from. I had "Wheels on the Bus" stuck in head all last summer from the Raising Readers program. Right now it is Bob Dylan's "Positively 4th Street." The reason is that I memorized that song last year some time and I've forgotten a couple of verses. I keep going through it in my head hoping to find them.Teaching kids ukulele at the Boys & Girls Club, “Muffin Man” is a permanent ear worm.