The world is a thing of utter inordinate complexity and richness and strangeness that is absolutely awesome. - Douglas Adams

The available worlds looked pretty grim. They had little to offer him because he had little to offer them. He had been extremely chastened to realize that although he originally came from a world which had cars and computers and ballet and Armagnac, he didn't, by himself, know how any of it worked. He couldn't do it. Left to his own devices he couldn't build a toaster. He could just about make a sandwich and that was it.

"Hey, you sass that hoopy Ford Prefect? There's a frood who really knows where his towel is."
(Sass: know, be aware of, meet, have sex with; hoopy: really together guy; frood: really amazingly together guy.)

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.