Update: Some misquoting and such involved here. See corrections.
Well, this is a bummer, Morgan Spurlock making fun of retarded people working at McDonald's while speaking to a high school.
I linked to the Independent article, because it seems to be the most thorough. All of the other articles I skimmed are shorter and shriller.
He has since apologized in some form.
It sounds like he was a little pissed off to start with:
He said that before his talk he was asked not to talk about McDonald's because a member of a local education board owned a McDonald's franchise - a claim that was impossible to verify over the weekend.
Still, not cool. (And I'm doubting this claim—who invites Spurlock to speak and then asks him not to talk about McDonald's? Highly unlikely.)