The Rabid Paladin

This is something of a public service announcement. I don't remember where I learned this, but here's a sure-fire cure for having a song stuck in your head:

Amazing Grace
Gilligan's Island theme song

 Sing the words to one to the tune of the other. In your head or out loud doesn't seem to matter. It works every time (for me so far). The cognitive dissonance will wipe out whatever is there and neither song sets itself in its place. It's like a psychic reboot.