Weapons of mass disappearance
Dammit, those smart Iraqis managed to get rid of their WMDs just before we invaded. Well, I suppose now that we're here, we should have a look...
dumdedum. Don't see any. Hm.
But they're definitely here! We're AMERICAN you know, we can't possibly be WRONG. It's those damn Iraqis and their magic invisible dust again.