What is Penny Lock?
1.
To lock someone into a room by hammering a stack of pennies between a closed door and the door frame.
Optimal conditions utilize just one more penny than necessary, making it impossible to remove the pennies without taking the door off of it's hinges.
"Why wasn't Jeff at practice today?"
"He got penny locked into his dorm."
"Ouch. How bad?"
"They used damn-near a whole roll. His roommate had to take the door out of the frame when he got home."
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