Our health relies entirely on the vitality of our fellow species on Earth.

When I first started out, I was a bad actor.

I realized early on that success was tied to not giving up. Most people in this business gave up and went on to other things. If you simply didn't give up, you would outlast the people who came in on the bus with you.

Henry: Well I'm sorry about your head though, but I thought you were one of them. Indiana: Dad, they come in through the doors.

It doesn't interest me to be Harrison Ford. It interests me to be Mike Pomeroy and Indiana Jones and Jack Ryan. I don't want to be in the Harrison Ford business. I take what I do seriously, but I don't take myself seriously.

Behind every great man is a woman. Telling him he's not so hot.

American Graffiti was the first movie where the director let me have any input. It was the first time anyone ever listened to me. George thought my character should have a crew cut, but I wasn't happy with that idea. I'd always had pretty long hair back then - in college, particularly - so I told George my character should wear a cowboy hat. George thought about it and he remembered a bunch of guys from Modesto, California, who cruised around, like my character, and wore cowboy hats, so it turned out that it actually fit the movie.