If Monty Python is an interest, you might also consider "The Road to Mars" by Eric Idle. It's a sci-fi farce (is that last word even necessary after saying "Eric Idle"?) featuring a pair of touring comedians and a humorless robot attempting to understand comedy and reduce it to mathematical formulae.
And then, if this serves as a gateway into sci-fi that is funny, "The Hitchhiker's Guide to the Galaxy" becomes mandatory reading. It may pique his interest to know that it predicted something very like the internet before that was a thing, and inspired the term "ethernet" as a result.
