NFL will eject coaches for two unsportsmanlike conduct penalties – ProFootballTalk
This is odd; I have never heard about it until now. In fact, I was watching the Nebraska-Oregon game on Saturday and as soon as they penalized the Oregon head coach, the ref said this is his first unsportsmanlike conduct penalty before being disqualified after his second. I've heard of that happening in college where two unsportsmanlike penalties for players gets themselves disqualified which is the same rule in the NFL now ever since Odell Beckham Jr. committed three unsportsmanlike penalties against Carolina. I've heard that happening with players but not with coaches.