The moment at which two people, approaching from opposite ends of a long passageway, recognize each other and immediately pretend they haven t. This is to avoid the ghastly embarrassment of having to continue recognizing each other the whole length of the corridor.

Anything that happens, happens.

Yes, it is true that sometimes unusually intelligent and sensitive children can appear to be stupid. But stupid children can sometimes appear to be stupid as well. I think that's something you might have to consider.

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.

The longest and most destructive party ever held is now into its fourth generation and still no one shows any signs of leaving. Somebody did once look at his watch, but that was eleven years ago now, and there has been no follow up.

How do you know you're having fun if there's no one watching you have it?

If the Universe came to an end every time there was some uncertainty about what had happened in it, it would never have got beyond the first picosecond. And many of course don't. It's like a human body, you see. A few cuts and bruises here and there don't hurt it. Not even major surgery if it's done properly. Paradoxes are just the scar tissue. Time and space heal themselves up around them and people simply remember a version of events which makes as much sense as they require it to make.