I work at the library, and I listen to headphones all the time. I just bought Beck's Midnight Vultures and I'm rockin' it and where I need to be is next to some girl who's looking at books, she's a pretty girl (but I'm spoken for) but the song "Debra" was playing. For those of you who don't know, that's Becks song where he sings high falcettos and sings, "I wanna get wit you girl... and your sister." I was right next to her, and it was loud, so I'm sure she could hear it. I wanted to laugh. The only other example I can currently thinking of, my girlfriend wanted some "make out music" while we were... you know. The only thing I had that wasn't sterotype porn music that I could think of was Muse's Showbiz. When Muscle Museum came on and started with that bassline, for some reason it was hilarious and we both laughed.