i just noticed something in reading satoshi's old posts on the cypherpunk mailing list: he uses two spaces after a full stop, not just one. i don't have hard data, but i believe this practice correlates strongly with age. that is, i suspect very few people younger than 35 have learnt to type that way.
He may have been doing that just to throw you off, though. Unlike most ways of modifying your speech patters, that's very easy to do.