A woman walks into the doctor's and says, "Doctor I can't stop singing these two songs, is there anything wrong with me?"

The doctor says, "What songs are they?"

"'Delilah' and 'The Green Green Grass Of Home,'" the woman says.

The Doctor says, "You have the Tom Jones Syndrome."

"Is that rare?" asks the woman.

The Doctor replies, "It's Not Unusual!"