Remember the Tuck Rule? Las Vegas Raiders fans, we know you do, as it's not exactly your favorite thing to ever happen to your franchise, but just as a refresher: during the 2001 AFC divisional game, Tom Brady -- who at that point was still Drew Bledsoe's replacement and not the likely greatest quarterback of all time -- dropped back to pass. Charles Woodson tackled him, Brady fumbled, the Raiders recovered, and the New England Patriots' Cinderella season came to a close.
Except Brady hadn't fumbled. An obscure rule decreed that even though Brady appeared to be tucking the ball into his chest, it was still technically a passing motion, and therefore the play was ruled an incomplete pass.