HEH?!?!?

This is a quick video from Miles at bedtime. As you can see, he has picked up this very distinct "HEH?!?" question that he uses both to ask "what? I can't hear you." and "what? I don't know what those words are." Either way, it is not a very attractive sound or habit and we are looking to teach him out of it. But when we were up in Reno last week, I noticed that both Tim and his father do the same thing, so it might be hard to teach out 3 generations of patterns...