What's so funny about that song is that it's so bad, and it's supposed to be bad, and even the guy that sings it hates it.... but it's so goddamned catchy and it sticks in your head for days, and you find yourself enjoying it even if you don't want to. At least, I do.
It's definitely one of those movies to curl up under a blanket and eat peppermint ice cream while watching.