This guy goes to the doctor and says, "Doc, I can't stop singing certain songs. All morning I've been humming 'The Green, Green Grass Of Home.' Yesterday it was, 'Delilah.' Last week I sang 'What's New Pussycat?' at least 100 times! What's wrong with me?"
The Doctor says, "Sounds like Tom Jones Syndrome to me."
The man says, "Never heard of that. Is it common?"
Doc says, "It's not unusual."