That makes me think of a book of logic riddles my Dad used to own called, What Is the Name of This Book? It had a whole section devoted to Alice in Wonderland with Tweedle-Dee and Tweedle-Dum; for instance, it had Tweedle-Dee lie to people only on Tuesdays and Thursdays while Tweedle-Dum lied on every day but Sunday, etc. Reminded me of those two for some reason. ^____^