 What isn't something the guest expects the younger man to do?
But some men aren't sane; thus it isn't always so! You will, you know, so why quibble about it? At least, you always have ... or do ... or will. And naturally, since we have the same tastes, you can make the same for me as you're having. Yes, it'll be pretty obvious it must be a time machine. You wouldn't care if you saw a man in a leopard-skin suit; you'd figure it was some part in a play and let it go. You must be playing in 'Atoms and Axioms.' "Thanks," you mutter, wondering what kind of civilization can produce guards as polite as that.
 listen to his directions very carefully
 steal something from a museum  take credit for an invention from the future  run the time machine  listen to his directions very carefully