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The gap is there so you can look in and see if anyone's in there before walking in and sitting on the pooper's lap.

Someone should invent a mechanism that "locks" the door in place from the inside so that this can't happen.

What if... This is crazy, but what if the lock also exposed different colour so a locked one is red, but an unlocked one is green? ;)

What a preposterous and illogical suggestion.