The biggest danger we face is overfishing. We literally could fish out our oceans, some scientists believe, in the next 40, 50, 60 years. We are fishing out the top of the food chain, and it's pretty crucial because about 200 million people depend on fish and fishing for their livelihood, and about a billion people, mostly in poorer countries, depend on fish for their protein. So this is a big problem. Good news is, it's fixable.

I am forever grateful for Cheers.

The planet will survive. Whether we get to be here and enjoy it, or enjoy life as we've known it, is what's questionable.

I had trouble hanging around [Shelley Long] until we stood onstage together, and then I was in heaven.

One person goes off and works in Houston the other person goes off to London and you're on the phone to each other and somebody is paying you to kiss somebody else. It's very bizarre being an actor.

I was going through so many changes in my life - separation with my wife, having an affair - that was all very messy and public. It felt like if I really wanted to rock my boat and make changes in my life and who I am and how I am, that would also mean moving on from Cheers.

Around year seven or eight, you'd kill yourself when you realized Norm had to enter and you had to come up with a new beer joke.