The Lurker!

There's a Genesis song called 'The Lurker' but in this case I'm at the Cashopoint/ATM getting some cash out for F.M.i.L.
You just never know who is lurking behind you and just because it's a little fluffy dog doesn't mean he isn't going to attack you once the money comes out!
I first noticed these little rear view mirrors  last year, very handy and simple security measure.

This Asian man is obviously a bit nervous of the people behind him being too close.
https://www.youtube.com/watch?v=yEX0Y2IrMJc