A double tap to the head to make cetain the bomb (hoax or not) isn't detonated.
Case closed.
Ah, so no suicide bomber ever uses a dead-man's trigger? Furthermore, bomb aren't advertised, EVER. They don't have blinking lights on them. You see blinking lights, you see bomb, that's movie training, not real world bomb identification. God forbid you are given a gun and turned loose in a lite-brite factory.