I've had the song, "don't worry be happy" playing in my song since I fear heard it playing over the loud speaker at the local strip mall in 1988. It's a kind of mantra I guess, I literally have found myself singing it every few days my whole life.
The thing is, come to think of it I'm pretty messed up, so maybe getting that song stuck in my head wasn't such a good thing after all. 🙂 Maybe I should tell my therapist about this.