If somebody thinks they're a hedgehog, presumably you just give 'em a mirror and a few pictures of hedgehogs and tell them to sort it out for themselves.

The Guide is definitive. Reality is frequently inaccurate.

A hole had just appeared in the Galaxy. It was exactly a nothingth of a second long, a nothingth of an inch wide, and quite a lot of million light years from end to end. As it closed up [...] Two hundred and thirty-nine thousand lightly fried eggs fell out of it...materializing in a large woobly heap on the famine-struck land of Poghril in the Pansel system. The whole Poghril tribe had died out from famine except for one last man who died of cholesterol poisoning some weeks later.

He would have felt safe if alongside the Dentrassis' underwear, the piles of Sqornshellous mattresses and the man from Betelgeuse holding up a small yellow fish and offering to put it in his ear he had been able to see just a small packet of cornflakes. But he couldn't, and he didn't feel safe.

SHOEBURYNESS (abs.n.) The vague uncomfortable feeling you get when sitting on a seat which is still warm from somebody else's bottom.

Marvin trudged on down the corridor, still moaning. "...and then of course I've got this terrible pain in all the diodes down my left hand side..." "No?" said Arthur grimly as he walked along beside him. "Really?" "Oh yes," said Marvin, "I mean I've asked for them to be replaced but no one ever listens." "I can imagine.

The fact that we live at the bottom of a deep gravity well, on the surface of a gas covered planet going around a nuclear fireball 90 million miles away and think this to be normal is obviously some indication of how skewed our perspective tends to be.