What’s a conspiracy theory you actually find believable?

On November 22, 1963 there was the assassination of John F. Kennedy. It is perhaps the most analyzed event in American history. It is concluded that Lee Harvey Oswald did the assassination, but it has come to my attention. That there might have been two different shooters. It is just a theory. It sounds believable, but it also sounds believable that just Lee Harvey Oswald shot all three bullets. What does anyone else think? Thank you very much for reading. Have a great night.