What song is stuck in your head now? Why?

[youtube=https://www.youtube.com/watch?v=2EHXH0hYkuU] its in my head caus I'm learning to play it on the guitar lately.

Britney Spears Womanizer because of JohnOlingers post :D
[youtube=https://www.youtube.com/watch?v=x9xQZQn-3ok]

don’t ask me why, but it’s the theme song to zoey 101

[youtube=https://www.youtube.com/watch?v=cegdR0GiJl4]

I am not sure why

Uptown funk ...not sure why

I love this clip[youtube=https://www.youtube.com/watch?v=uMK0prafzw0]