John is sweet, approachable, uncomplicated, and irresistable. He has sort of a Clark Kent/Superman dual personality -- you think he's all harmless, cute, and geeky until he turns his laservision on you and starts controlling your mind.
Also, if you are gullible like I am, watch out: he will make fun of you. "Deadpan? What does deadpan mean?"

Oh, one last thing: the man somehow got himself the hottest wife known to humanity; and she's nice, too! The two of them are a force to be reckoned with.