I noticed this question pop up on the StackOverflow homepage: http://stackoverflow.com/questions/3527493/disable-multi-select
The OP seems to have answered his own question (it was a clarification, actually, but that's common for new users), but the rep displayed for the two seems to be different.
I clicked through both, and ended up finding two different unregistered users. When did we start giving unregistered users profile page and reps? Even stranger, is that the user seems to have two of them, maybe through two different logins, I don't know. Here's one of them, the one that answered his own question and apparently got one upvote for that.