I noticed that no one here mentioned the threads that Shakespeare was written by somebody other than Shakespeare. That was a recurring subject until septimus left. But as cliched as relativity-being-wrong theories.
My all time favorite lunatic theory was something so out of left field that I’ve never come across another variant.
@DChord568 treats us to probably hundreds of posts trying to crush the notion that Allan Sherman meant the reference to Ulysses to mean the book by James Joyce. Either a textbook perfect example of CT logic or a masterful imitation. I could believe either one.