The Soundtrack of my Life

Does anyone else have little songs that play in their head for certain functions they perform? Let me explain... Every time I shower, the Monchichi theme song plays perseverantly in my head. When I am walking, I often sing "I'm walkin'...yes indeed and I'm talkin' bout you and me..." There are also a few little ditties that have no lyrics...I hesitate to call them "orchestral," but that is the closest I can come to the nature of these particular movements. Anyone else this weird?