Double Take!

While on my lunch break, I often pass by this door at a nearby building. I had to do a double take one day when something occurred to me...there's a deadbolt on either side!

On further inspection, the door is an outswing (it swings outside rather than in) with regular hinges. An outswing door usually has hinges with non-removeable pins, so no one can pull the pins out of the hinges to remove the door (and essentially break in). The addition of the deadbolt on the hinge side ensures no one can pull the door off the regular hinges.

Still, I had to do a double take. I've never seen that before!