As much as I love to mock the unintentionally hilarious "tech" of L. Ron Hubbard, there is no substitute for hearing it from his own mouth. This priceless piece of batshit-crazy gold is from 1967, just after Hubbard completed the infamous "Wall of Fire" aka The Xenu Story.
In this gem we are treated to Hubbard-the-raconteur, Hubbard-the-long-suffering-martyr and Hubbard-the-savior-of-mankind, all wrapped up in a turgid tale of evil perpetrated by (you guessed it) The Eeeeeeevil Psychs.
If you know anyone who thinks that L. Ron Hubbard couldn't have been that crazy if all these people still follow him, have them listen to Ron's Journal '67. When they're done, if they still think he wasn't totally bonkers, then tell them that L. Ron has a bridge for sale and direct them to the nearest org. Oh, and don't forget to tell them to take their checkbook.