I've been caught masturbating before, by my mom. Dosen't sound quite as bad as that, but it was embarassing nontheless. Ysee, it was to those dancing girls in Duke Nukem 3d. The ones that'll only flash you if you hit the spacebar and duke goes "Wanna Dance?"  and "Shake it baby!"  I think that's what alerted my mother. So now I always turn the speakers off when I masturbate.