What's your dirty little secret?

Just had a funny thing happen to me at my flat, so thought I'd see if anyone cares to join in:

A friend is staying with me returned back from doing some food shopping (I'm holed up sick) and entered the apartment to find me rocking out to The Association's "Windy" coming from my crappy computer speakers. After almost succumbing to a laughter-induced heart attack, he managed to get out the following sentence: "Dude, what the sh*t are you listening to?"

So what's your guilty pleasure? What do you listen to that would suprise your friends? (I mean, I'm not embarrased about anything I listen to, but we've all got 'em, those records we only pull out when we're alone because it's just easier not explaining!)