Shy guys hide in a semi-circle of giant doghouses. Your character picks a doghouse, knocks on the door, then backs up to wait. The door opens. You'll either get a Shy Guy or get pulverized by a giant Chain Chomp lunging out of the darkness at you. What makes it funny are the mind-games Nintendo plays with you here, using suspenseful music, fake-outs & long pauses to catch you off-guard.