I'm not sure how this started. I think Ash was joking with Harper one day after he was doing some sort of asinine two-year old thing (you know, like wiping off candy with a wipe so that it will taste different/better, maybe?).
So now we have our own little Steve Carrell in a weird voice I'm not so sure about.
And, for those of you who are clueless about the movie reference, here ya go. (Anchorman, circa 2004).