Most useless emergency exit…ever

Actual emergency exit sign at Denver International Airport:
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I can’t help but think of the worst case scenario. How long must 15 seconds be if a fire is spreading through the room? Even worse, what if a gunman is shooting people? (Eveyone else in this area would have already been disarmed.)

If you are looking for a way so that people will not be able to get to safety, I think this would have to be it.