Usability annoyance of the day

I found myself on the Cooperative bank's online banking site today, pulling my hair out. Why, you ask? Well, because some genius decided that the bank should log the user out whenever the Back button is pressed. They even display a message telling you this after logging you out. Then you have to provide your sort number, account number, key code and some personal bit of information before you can get back in, only to be logged out in a few seconds when you forget and hit the Back button again. I swear I did this four times. Whomever designed that interaction should be forced to watch Battlefield Earth non-stop for a week.