"There is no cannibalism in the British navy, absolutely none, and when I say none, I mean there is a certain amount"

In this quote, Graham Chapman is using paradox and sarcasm to make a declaration about the British navy. He begins by saying that there is no cannibalism in the navy, but then instantly contradicts himself by saying "definitely none." This reveals that he is not being major and is instead making a joke. He then goes on to say "when I state none, I suggest there is a particular amount," which further emphasizes the absurdity of his statement. Chapman is using humor to poke fun at the concept that cannibalism might exist in such a prestigious and disciplined institution like the British navy.