I just received an "Enthusiast" badge on Code Review.
As much as I'd like to keep the badge, I'm certain that I did not visit Code Review every day, for 30 days straight.
Is this a bug?
I don't have the "consecutive days" stat:
But I still got the badge:
And it happened again. Reported here.
Update: I just received a third badge in error; this time a fanatic badge for Software Engineering. This is even stranger, since I use that site less than I do CR, and I don't recall getting the 30 days badge.