"I'm not completely insane because, you know, a cartoon that might feature the voice of an oak tree- The oak tree has a face. And I think, to be honest, I think it would quite look like your face did," he says. He is rather fond of doing this voice because it took me through well in my childhood when I was growing up. "The key is when you say heis, I live in a heis and you say it like this - It rhymes with mice."