It's good to refrain from being angry with others.
Gary is on the subway when the subway has to brake hard and Kyle who wasn't holding a hand rail comes flying into Gary hurting him.
Gary wants to show his displeasure to Kyle for causing him pain.
Gary tells Kyle that he really needs to hold the hand rail because of situations like this and that he really hurt him.
Gary starts to foam at the  mouth and silently grabs Kyle by the neck and stares into his eyes while squeezing his throat.
Kyle is remorseful and apologizes to Gary and asks him if there's anything he can do to make him feel better.
Kyle is utterly terrified as Gary looks like a maniac and Kyle is finding it hard to breathe.