Here is a fire alarm that would surely teach pranksters a lesson when falsely pulling fire alarms.

To use the device, the sender of an alarm must pass a hand through a special compartment to reach the signal dial. Once the dial has been turned, the sender’s hand is locked in the compartment until released by a fireman or policeman with a key.

The prankster would either be arrested by the police or burn to death in a legitimate fire.  Yeah, not exactly the best fire alarm design.