I've had the song from that chocolate, Bueno, ad in my head. You know...
L is for the way you Look at me
O cause you're the only One I see
V is Very Very extraordinary
E is Everything and such and such and such...
I also have heavy metal and the two don't blend. One exam I a Mudvayne song was blaring in my head. It stopped the second the exam started and started again when it stopped, at the place it had left off.
When I was in year three, I remember during a multiplication tables test I couldn't stop thinking nah, nah, nah, nah, nah BATMAN! and I even hummed it out loud and got in trouble.