Mystery Nipple Appears During Tosh.0
John Riggs posted a video on YouTube of a Tosh.0 episode he had recorded on his DVR. Right before the show cut to a commercial there was a 'blip' on the screen. When Riggs slowed his DVR down to a shot-by-shot speed, the blip turned out to be a picture of a man's nipple.
Subliminal advertising a method where advertisers try to slip in hidden messages that may flash on a screen. I'm not sure what Tosh was trying to promote with the nipple flash, but its not surprising since he is (or almost) naked in almost every episode for apparently no reason.