If the absolute worst thing that will happen to you is a 4 minute double minor penalty, and the guy you're punching in the face never does anything about it, then why wouldn't you? Only a few things feel better than punching another man in the face.
I like watching Gaffigan and Stanhope back to back. It goes from nice and happy and light to daaaaaarrrrrrrrrrk in a hurry. Makes me smile. Like watching a sunny day turn into trailer park destroying tornadoes.