It just happened to me again.

I was clicking to open another table, and a table that I was playing popped up and I accidently put in a good sized raise on 10-2 off suit.

I play Bodog and this crap seems to happen to me a lot because I play the tables on overlap. Of course, I never tell at the table that "I hit the wrong button" because I think that the ocassional totally random (and usually stupid) bet keeps 'em guessing.