I think it relates to when you edit a question and then undo those changes. A bit like ROLLBACK TRAN !!
answered Mar 12, 2010 at 04:57 PM
I was able to get the badge after clicking rollback. Rollback did not appear until after somebody else edited my question.
Thus it appears that you do not have the option unless it is your own question or it is a community WIKI.
answered Mar 13, 2010 at 04:08 PM