The most egregious ever may be Ravens Tony Siragusa riding Rich Gannon to the ground like a hobby horse, giving him the hard shoulder, deliberately body slamming him, long after the throw was out.
It’s just such a cheap shot play, absolutely trying to hurt someone and literally nothing at all like what Matthews did. That’s what the NFL is trying to avoid, yet remarkably Siragusa was rewarded with a sideline job after retiring. Hell, I’m not sure the refs even threw a flag on that one.
https://youtu.be/C__R2dGa6qs