Roy “Horsecollar” Williams really missed out. He broke quite a tidy sum of bones with that move. Dirty? Hell yeah.

This is the first one that came to mind for me (even if it's unofficial). Same as the "Tuck Rule" means Brady rule.

Yeah the Brady rule (made an angry face at Brady, 5 yards) is such a wonky thing that can be misused. Horsecollar in the other hand…I think I’ve seen a couple guys thrown down by jersey alone so yeah no need to grab pads in that battle. At the time though when I saw it live, I would say “you test Roy downfield…”