Oh, thank you. You're quite right, I'd hoped someone would do the analysis. The appropriate model should either be a program in a loop, or a program run less than every second (or however long it takes to say "what"). I just had an uneasy feeling that something was wrong.

Zaphod's original specification of the Arthur Dent script never mentioned good randomness.

Yeah, that's what I was thinking, but it didn't manage to prevent me saying anything. Of course, if you put all this in a footnote on the T-shirt, the T-shirt would be really geeky :)