When the employees of a restaurant attended a fire safety seminar, they watched a fire official demonstrate theproper way to operate an extinguisher. “Pull the pin like a hand grenade,” he explained, “then depress the triggerto release the foam.” Later an employee was selected to extinguish a controlled fire in the parking lot. In her nervousness, she forgotto 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.