In episode 2F09, when Itchy plays Scratchy's skeleton like a xylophone, he strikes the same rib in succession, yet he produces two clearly different tones. I me

In episode 2F09, when Itchy plays Scratchy's skeleton like a xylophone, he strikes the same rib in succession, yet he produces two clearly different tones. I mean, what are we to believe, that this is a magic xylophone, or something? Ha ha, boy, I really hope somebody got fired for that blunder.