I recently changed my username to Undo. I was amazed when I pressed Submit and saw that it actually went through - surely someone somewhere was using this same username.
Out of curiosity, I then search the SO user list for Undo - and found another user with Undo as thier name. They have 50 rep. I have around 1,500.
Is there some kind of pecking order, I.e. a high-rep user can 'steal' a low-rep user's name? Or is this a bug?
Or can two users have the same username without causing the SO servers to go down in a burning ring of fire?