If you're going to do an interview about a movie or anything like that, you're vulnerable. You say stupid things. Or if you're applying for a green card you feel very vulnerable and you're likely to spout out something stupid in the middle of it all.

I set out to be a cross between Lenny Bruce and Robert the Bruce.

Heckling is an act of cowardice. If you want to speak, get up in front of the microphone and speak, don't sit in the dark hiding. It's easy to hide and shout and waste people's time.

I love Scotland and I speak about it a lot, so people think I'm desperate to go back. They just take it upon themselves to say I'm going back, but I'm not. I'd rather concentrate on becoming a citizen of the world.

If I had a hammer, there'd be no more folksingers.

On George W Bush: That man sits at that desk in the White House with the button that can end the world. My father's younger than him and we don't give him the controls for the television.

Tread gently on anyone who looks at you sideways.