One of the major problems encountered in time travel is not that of accidentally becoming your own father or mother. There is no problem involved in becoming your own father or mother that a broadminded and well-adjusted family can't cope with.

I only know as much about myself as my mind can work out under its current conditions. And its current conditions are not good.

I don't go to mythical places with strange men.

One of the problems, and it's one which is obviously going to get worse, is that all the people at the party are either the children or the grandchildren or the great-grandchildren of the people who wouldn't leave in the first place, and because of all the business about selective breeding and regressive genes and so on, it means that all the people now at the party are either absolutely fanatical partygoers, or gibbering idiots, or, more and more frequently, both.

It takes a long time before we really get to grips with this [Darwin's 'On the Origin of Species'] and begin to understand it, because not only does it seem incredible and thoroughly demeaning to us, but it's yet another shock to our system to discover that not only are we not the centre of the Universe and we're not made by anything, but we started out as some kind of slime and got to where we are via being a monkey. It just doesn't read well.

Simple. I got very bored and depressed, so I went and plugged myself in to its external computer feed. I talked to the computer at great length and explained my view of the Universe to it," said Marvin. "And what happened?" pressed Ford. "It committed suicide," said Marvin and stalked off back to the Heart of Gold.

Ahenny (adj.) - The way people stand when examining other people's bookshelves.