A couple of of years ago my friend's MS Boys team is scrimming a nearby CYO team at the CYO team's gym. I got a chuckle when one of the home players thought I was a player, as I overheard "One of the [school name] players is here and he has a beard!"
Before the scrimmage, the coaches agreed to play man-to-man defense. The home team's assistant coaches and myself served as the officials. At the start of one of the later periods (4th or 5th), the home team goes into a zone defense after the opening throw-in. I eventually whistle them for an illegal defense, only to be told the coaches decided to play zone that period.