I didn't know quite how hilarious it was for Aleister Crowley to accuse Madame Blavatsky of being the Ripper, and then I came back years later, having hit the Spiritualists from another direction, and hurt myself laughing.

This is a favorite trick of Moore's and shows up very obviously in The League of Extraordinary Gentlemen where, if you're at all familiar with Victorian books for children, and Victorian 'underground' literature, you can absolutely hurt yourself laughing at the Invisible Man sequence.