here (but thanks to @jadedsecurity for posting the source pic)
i really don't know what to make of this. i want to believe the sign simply means you need to pull the fire alarm to unlock the emergency exit. but that lock on the fire alarm (who does that?) worries me and makes me think the worst; that you actually need a key in order to pull the fire alarm.
seems like a recipe for crispy critters if you ask me.