The song "...Baby One More Time" is creepy to start with. I personally think it's up there with "Every Breath You Take" in the ranks of songs people only think are romantic because they've never really listened to the words.
You would think that it couldn't get much creepier than the original single release with its disturbingly exploitative barely-legal star and high school setting. You'd be wrong.
Although you probably won't be surprised to find out who figured out how to make it creepier. I mean, this is the internet.
"...Baby One More Time
Ahmet & Dweezil Zappa
There's another cover by Marilyn Manson, but I can't seem to find a good copy anywhere on YouTube.