The mechanical STOP sign on a school bus…

The mechanical STOP sign on a school bus breaks, and the keen bus driver responds by pulling over, calling a maintenance truck, and holding the kids on the bus for more than an hour while it gets fixed.

Why? Well, it’s illegal for the bus to operate without a functional stop arm, you see. That bus driver had no choice: if that stop arm had been broken and he had dropped off the kids anyway, they would be in a huge amount of danger from crazy drivers who (without the stop-arm) would be unaware of the stopped schoolbus and children crossing the road!