This happened on the subway in Shanghai, China, and suddenly we have an urge to book a vacation to the East.

It doesn't come with any kind of explanation, so feel free to invent your own backstory. Is she merely in a rush and doesn't have time to stop off at home before her next appointment? Is she a spy who's afraid she'll be recognized by her outfit? Does she just not realize that what she's doing is rather strange? And did we mention that she manages to complete her task without even taking off her shoes? This is a talented woman.

You could spend your time coming up with whatever tale you like, or you can just sit back and watch a woman unashamedly get down to her skivvies in front of other people, and smile, hoping that the next time it happens, you'll be there.