Does Applejack ever say "Do what?"

Is there a youtube link somewhere? I feel like she has. An even more spirited upvote for "Do what, Twilight?"! This is relevant to an inside joke with some friends where I said "do what" thinking of Jeff Boomhauer from King of the Hill? And someone thought it was meant to be from Applejack. So now everypony can't stop saying "Do what". Thanks for the help!