by calling for a UN investigation of 9-11, and US delegates (plus a few of their friends) run away in phony indignation:
U.N. delegates walk out during Iranian president's speech
Be sure to listen to his actual speech at the above link. Makes sense to me. I don't know enough about Ahmadinejad to have formed an reliable opinion about him, but whenever he's mentioned it always seems he's unfairly demonized.
This is pretty big news. For every delegate who left there are quite a few who stayed ... and the world is a heck of a lot bigger than the US and her allies.