Colin Powell's WMD dog and pony show in front of the UN council looked really fishy at the time, as if it was being sabotaged by the people who had to make up all that bullshit. Of course, that didn't matter neither because GWB simply WANTED to invade.

Side note: Colin Powell always seemed like one of the more reasonable people in the Bush administration, and he had the decency to later criticize and apologize for his own actions.