Just saw the last few minutes of an episode of some teen drama show:
One guy: "Blarg, I die."
Keith: "Hey bro! Nice to see you again."
Guy: "Uh... Listen, I'm really sorry I shot you in the back while you were trying to talk a guy out of commiting suicide. I guess I was always jealous of how nice you were."
Keith: "Meh, it's all cool. You felt bad about it afterwards and that's apparently all I need to forgive you. Because I'm so nice."
Guy: "...Really? I'd think you'd be somewhat pissed off."
Keith: "Naaaaaaaaaah. Heck, I'm so incredibly nice they gave me a +1 reservation for getting into Heaven. And I pick you. Because I'm a nice guy."
Guy: "Okay then."
*They go to Heaven*
I think the moral of the story was that Keith is incapable of any emotion other than cheery benevolence.