Restroom privacy

Have you ever noticed that most public restrooms have a gap? Usually this gap is between the point where you lock the door. Crazy huh? I hadn't thiought much of it until my cousin who was visiting mentioned that this is very different from the UK. Not to mention the whole restroom vs. toilet debate between the UK and the US.
The restrooms at the airport, at the outlets, at the malls they all seemed to have this same gap that we don't tend to think much of it but the gap is big enough to be able to tell if someone is in the cubicle or not. So next time you use a public restroom think twice becausre you might not be totally alone as you might think.