Mark Steyn offers an equivalent scenario:
You know what’s great fun to do if you’re on, say, a flight from Chicago to New York and you’re getting a little bored? Why not play being President Ahmadinejad? Stand up and yell in a loud voice, “I’ve got a bomb!” Next thing you know the air marshal will be telling people, “It’s OK, folks. Nothing to worry about. He hasn’t got a bomb.” And then the second marshal would say, “And even if he did have a bomb it’s highly unlikely he’d ever use it.” And then you threaten to kill the two Jews in row 12 and the stewardess says, “Relax, everyone. That’s just a harmless rhetorical flourish.” And then a group of passengers in rows 4 to 7 point out, “Yes, but it’s entirely reasonable of him to have a bomb given the threatening behavior of the marshals and the cabin crew.”
Hat tip to David Ross.