The song I despise most is an old one: Neil Sedaka - Happy Birthday Sweet Sixteen.

It is an awful song and the lyrics are creepy as... *shudders*

I only came to know about it because my ex-partner (the one I lived with for nearly 3 years) used to listen to Oldies radio (Gold, formerly Capital Gold), and it came on pretty much all the time. Awful, awful, awful! >_<

One of my friends commented as well how pervy the lyrics were, even for the Sixties.