You might ask: Maybe the aliens do have a sense of humor, but you’re not telling funny enough jokes? This is roughly the equivalent of trying to speak English very loudly, and very slowly, in a foreign country, on the theory that those foreigners must have an inner ghost that can hear the meaning dripping from your words, inherent in your words, if only you can speak them loud enough to overcome whatever strange barrier stands in the way of your perfectly sensible English.
