It's far less common for football coaches to be ejected than baseball managers and basketball coaches. In fact, no NFL head coach has ever been ejected from a game.
But that could change with an addition to this year's rule book resulting in automatic ejections for two unsportsmanlike conduct fouls, which not only applies to players, but also "non-player personnel" including management personnel, trainers, equipment personnel and, of course, coaches.
The two-foul rule will only apply to specifics types of fouls, which include abusive language directed at an opponent or official. It's rare for a coach to be flagged multiple times for an abusive language foul, but it's still a possibility.
If it does occur, that coach will become the first in NFL history to be disqualified for a game.