There've been a lot of shows debunking the conspiracies surrounding the Kennedy assassination. (I'm going to assume that's what you mean.) The ones on the Discovery Channel were episodes of a series called Unsolved History, and while I don't know how to get a hold of them other than contacting the Discovery Channel to buy copies, they'll pop up now and again, between episodes of shows about mechanics.
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"