I went to my doctor to tell him I couldn't stop singing 'The Green Green Grass Of Home' when driving through countryside, or when I stroke my cat, its 'What's new Pussycat'. Even in my sleep, I told him I dream and sing 'Delilah' which worries the wife no end.
The doctor said to me 'It would appear you have the early symptoms of Tom Jones Syndrome'
I said to him, 'Well I have never heard of that, is it common?'
'It's Not Unusual' replied the doctor.