The fun thing about the knights and knaves puzzle is that no matter what goofy variant you come up with, not only has it already been considered, some maniac has worked out the optimal solution. What if there's a third guard who lies or tells the truth at random? It's been done. What if the guards will only answer yes/no questions, and also for some reason they understand your language but refuse to speak it, and you don't know which of the two words they may respond with means "yes" and which means "no"? Literal thesis papers have been written on that one. Logicians are absolute freaks for these guys.
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