One time a few years ago I tried to breed Seven to Floyd. He got on top of her and started the old mating dance, and in typical fashion she bucked really hard. So hard, in fact, that he was knocked completely off of her and his head landed on his own back near his vent.
He picked up right where he left off: dancing his chin/neck on his own back. He was caught in a feedback loop and was getting unbelievably excited at all the stimulation coming from all directions. He was twitching like crazy, every time he would start "catching up" with himself (getting his chin farther up his back) he'd also start "getting away" and bolt ahead, which of course was fruitless.
Twitch twitch! Slide sliiiide, caress caress! Twitch twi-BOLT! GO GO GO stop! Twitch twitch! Ooh, she's excited now I can tell! Sliiiiide twitch sliiiiide, twitch twitch, BOLT! GO GO GO Stop! Twitch twitch! Oh yeah, baby!
It took a few minutes for him to figure out what was going on. I think if I had laughed any harder I would have had a seizure.