Mine doesn't pop up much, either, but here's what happens every time:
*Roomate is playing the same song for the hundredth time, and I crank my headphones to drown it out.*
1) Someone calls, or I go talk to someone, so I pause my music
2) I get off the phone or whatever, and I put my headphones on
3) I don't immediately turn my music back on (But the volume is still cranked)
4)DA-DING!!!1!1!!!
5) I fall out of my chair.
Repeat at the most inopportune moments.