Actually my all-time favorite thread of that nature (that was several thousand posts) was the "three Arab terrorists are locked in an airliner bathroom shaving their entire bodies!" that happened in Arkansas...that was a couple years ago, I think.
Anyway, it turned out to be two Indian Gas station owners on their way to a convention of Gas station owners in Las Vegas. One of the guys decided to shave in the bathroom of the airplane before landing, and he took his shirt off to not get shaving cream on it; a flight attendant decided he was in there for too long and barged in, she freaked, started screaming at him, he gave her lip back, his friend got involved, and then some poor hispanic guy who didn't do anything and just happened to be sitting across from where they were got picked up merely for looking middle eastern. But the story as told got completely out of hand and people clung to believing the initial story.
That was a good one. Now, if only those Indian gas-station owners had been gay . . . .