Iranian President Mahmoud Ahmadinejad is scheduled to speak Wednesday before the U.N. General Assembly, and he already seems to be warming up for some fiery remarks. In an interview with the Associated Press on Tuesday, Ahmadinejad called for a new world order that will do away with what he says is American bullying over international affairs. On Monday he said Israel has no roots in the Middle East and would be “eliminated.” As pundits brace themselves for what the leader has in store for his remarks Wednesday, here’s a look back at some of the most incendiary—and most colorful—moments from world leaders at past United Nations events.