When employees of a restaurant attended a fire-safety seminar, they
watched a fire official demonstrate the proper way to operate an
extinguisher. "Pull the pin like a hand grenade," he explained, "then
depress the trigger to release the foam."

    Later, an employee was selected to extinguish a controlled fire in
the parking lot. In her nervousness, she forgot to pull the pin. The
instructor hinted, "Like a hand grenade, remember?"

    In a burst of confidence, she pulled the pin-and hurled the
extinguisher at the blaze!