JFK conspiracies: the best ones are the least likely

59 percent of Americans now believe there was more to JFK's death than a lone gunman. Fred Kaplan was an adherent—until he set out to verify the factual claims made by conspiracy theorists.

One day, I looked up the footnotes in those books, most of them leading me to the multivolume hearings of the Warren Commission. I was shocked. The authors had taken witnesses' statements out of context, distorted them beyond recognition, and in some cases cherry-picked passages that seemed to back their theories while ignoring testimony that didn't. It was my first brush with intellectual dishonesty. … It's worth recounting the conspiracy buffs' arguments that I found most persuasive—and why they collapse under scrutiny.

Has anyone tried to Twixtor the Zapruder film?

UPDATE: They have. Here's one effort, interpolated to 30fps.