Because if there's no sign-in sheet, and there's a room full of dudes waiting nearly an hour, and suddenly a pretty blonde girl with a clipboard arrives at the door and says "Who's first?"...well then everybody kind of starts to act like a god damn farm animal. And next thing you know you're pushing and mooing up against 50 different guys in 45 different types of plaid to get to the door. A border collie could run by and I totally wouldn't be surprised.
Or Babe.