Pulling hair, to my knowledge, wasn't actually illegal in the NHL when Dave Schultz did it to Dave Rolfe in 1974. It might have been, but I wasn't born, so I'm allowed to claim ignorance here. Anyway, it is illegal today, and Tom Sestito very obviously did it to Brandon Prust on Sunday at Madison Square Garden.
You can see it there around the :43 second mark. Should have been a match penalty, according to the NHL rulebook, but the officials missed it and it wasn't called. According to the New York Post, Sestito won't be penalized at all for it. The league has decided not to penalize him in any way for the incident.
Strange. I mean, we'll take it... but uh, he probably deserved something for that.