Anything invented before your fifteenth birthday is the order of nature. That's how it should be. Anything invented between your th and th birthday is new and exciting, and you might get a career there. Anything invented after that day, however, is against nature and should be prohibited.

Time, we know, is relative. You can travel light years through the stars and back, and if you do it at the speed of light then, when you return, you may have aged mere seconds while your twin brother or sister will have aged twenty, thirty, forty or however many years it is, depending on how far you traveled. This will come to you as a profound shock, particularly if you didn't know you had a twin brother or sister.

He almost danced to the fridge, found the three least hairy things in it, put them on a plate and watched them intently for two minutes. Since they made no attempt to move within that time he called them breakfast and ate them. Between them they killed a virulent space disease he'd picked up without knowing it in the Flargathon Gas Swamps a few days earlier, which otherwise would have killed off half the population of the Western Hemisphere, blinded the other half, and driven everyone else psychotic and sterile, so the Earth was lucky there.

The Guide says there is an art to flying", said Ford, "or rather a knack. The knack lies in learning how to throw yourself at the ground and miss.

...and the renewed shock had nearly made him spill his drink. He drained it quickly before anything serious happened to it. He then had another quick one to follow the first one down and check that it was all right.

Being offended by things is the world's big hobby at the moment. It's almost taken over from wearing goatee beards.

I don't like the idea of missionaries. In fact, the whole business fills me with fear and alarm. I don't believe in God, or at least not in the one we've invented for ourselves in England to fulfill our peculiarly English needs, and certainly not in the ones they've invented in America who supply their servants with toupees, television stations and, most importantly, toll-free telephone numbers. I wish that people who did believe in such things would keep them to themselves and not export them to the developing world.