Caveman
Arthur attempts to play Scrabble with a caveman, who is not even able to spell "Grunt" and "Agh", and "he's probably spelt library with one R". However, he does spell "forty-two", giving Arthur the idea to pull out letters from the letters bag at random to attempt to find the ultimate question; this results in the unhelpful "What do you get when you multiply six by nine?" which does not match the Answer.
Appears in fit the sixth of the radio series played by David Jason, the novel The Restaurant at the End of the Universe, and episode 6 of the TV series.
Read more about this topic: Loonquawl