It can be a tenuous relationship.
Everyone has seen it on the sidelines before. A quarterback's face mask grabbed by an irate head coach, who seems to be convinced that his signal caller will get the message if he just screams a few decibels louder.
Some are worse than others. Some are much, much worse. As bad as Nick Saban can get, he's probably quite pleased that Greg McElroy has yet to lose at Alabama.
Here are some coaches whose relationships with their quarterbacks aren't as rosy underneath.