I think having a listener come up and inform me that they have one of my songs stuck in their head after they've heard me sing and/or play it is about as nice a compliment as any songwriter can receive.

I remember this movie scene where someone was being tortured. The bad guys forced their victim to listen to, "She wore an itsy bitsy, teenie weenie, yellow polka dot bikini..." over and over again.

I know that, under such duress, I probably would have cracked.