Stuck In The Head

What causes a song to get stuck in your head? And why is it so difficult to get it out?

And why is it usually one you hate?

sunrise, I’m disappointed. When I saw the title, I thought that surely you were trapped in some military-type bathroom.

Has someone stolen your identity?

I know that song does it go something like,

In the year 2525,
If man is still alive,
If woman can survive
They may paaaauuuuuuuuse.

De de de de de ,

In the year 3535…
Wish it would get out of my head too.