There are two things you should remember when dealing with parallel universes. One, they're not really parallel, and two, they're not really universes

If life is going to exist in a Universe of this size, then the one thing it cannot afford to have is a sense of proportion.

He had extracted himself from the Cambridge one-way system by the usual method, which involved going round and round it faster and faster until he achieved a sort of escape velocity and flew off at a tangent in a random direction, which he was now trying to identify and correct for.

Earthmen are not proud of their ancestors and never invite them round to dinner.

He felt that his whole life was some kind of dream and he sometimes wondered whose it was and whether they were enjoying it.

And all dared to brave unknown terrors, to do mighty deeds, to boldly split infinitives that no man had split before--and thus was the Empire forged.

The last ever dolphin message was misinterpreted as a surprisingly sophisticated attempt to do a double-backwards-somersault through a hoop whilst whistling the 'Star Spangled Banner', but in fact the message was this: So long and thanks for all the fish.