It seems that when you have cancer you are a brave battler against the disease, but when you have Alzheimer's you are an old fart. That's how people see you. It makes you feel quite alone.

What do you call those things at the bottom of rivers? Frogs? Stones? Unsuccessful gangsters?

Personally, I think the best motto for an educational establishment is: 'Or Would You Rather Be a Mule?'

They know that people need witches; they need the unofficial people who understand the difference between right and wrong, and when right is wrong and when wrong is right. The world needs the people who work around the edges. They need the people who can deal with the little bumps and inconveniences. And little problems. After all, we are almost all human. Almost all of the time.

So, mistletoe, in fact, symbolizes mistletoe.

It's tough at the top. It's tough at the bottom. But in between you could use them for horse-shoes.

There's a lot of science in it, and as Slartibartfast [in The Hitchhiker's Guide to the Galaxy] said: 'I am a great fan of science, but I cannot do a quadratic equation.' I've never, ever been able to do one. I remember one occasion at Warwick University, when Jack and Ian were at their wits' end because I couldn't get it. I felt totally ashamed.