Over on Super User, I logged in accidentally with another Gmail account, and created a new profile.
Because of all the cookie/JavaScript/IP hocus-pocus, instead of a decent no-fuzz PHP login, Super User keeps coming up with this new account and logs in automatically. After a force clean of all cookies, dumping the cache and a restart, I managed to login with a different user account.
Now, how do I get rid of this accidental account?