I just skimmed most of this thread... gold!
Anyway, (and I apologise if I missed this and am repeating someone) I was surprised that no one called up "must of", meaning "must have". "Of" is not a verb!
I'm right there with all the Nazis who can't stand the misuse of apostrophes. And don't even get me started on people who think "your" is a contraction of "you are"! And yes, I am beginning sentences with a coordinating conjunction! Arrrggghhh! I'm gonna go shoot myself!!!!