My dad's trade school had this rule back in the 70s/80s. If you showed up and weren't clean shaven, you had to pay $0.25 for a disposable razor and small little pouch of shaving cream. If you refused, you were sent home for the day.

He had a teacher that he said was really well liked among the students, former Marine who I think served in Vietnam. The guy had a coconut carved into a monkey's head on his desk, and he'd tape a cigarette in its mouth. But he had some odd rules and, according to my dad, could be a scary dude at times.

Like, if he caught you yawning, he sent you out of the class because "You aren't full awake, and therefore didn't prepare for class properly with a proper night's sleep."

If the class got off track, or really pissed him off, he'd either: A. Lift one of those old-school metal drafting tables off all four of its feet and slam it back down, causing a HUGE boom sound that got everybody's attention, or, B. He'd drop-kick the coconut monkey head down the hallway before returning to the class.