[Voicing a cartoon] feels like going down a mysterious but joyful black hole. Once you relax for 15 or 20 minutes, and really go, "I don't care if I look like an ass," it's really fun to see what happens. You know that nothing is being visually judged.

Playing Sheldon is just heaven for me. I realize how enormously lucky I am to play a role that makes me so incredibly happy. As I told Chuck Lorre in a Christmas card a few years ago, I'm living a version of the dream.

I'm also a big American Idol fan. I think it's just great fun.

Realistically, there is a danger, of course, when you're going into someone's living room as the same guy every week. But I don't fear it because, I mean, there's really nothing I can do about it. I can try to combat it through the work, and maybe make sure I don't do Sheldon 2.0 in any other projects. But it's just really hard for me to find any negative side effects from this experience.

I don't think the jet-setting life is really for most people.

Home is where you feel unjudged, and where what I do isn't necessarily stupid or wrong.

In voicing so much is left to your imagination to create the world around you like that. It's really the essence of what's so fun for, I think, many people when they first start to want to be an actor, is that they realise they enjoy making up a world around them to exist in, a whole situation and a whole way of being. And even more so than theatre, animation requires that because there's just nothing to go on. It's in your head and your heart or it's not there at all.