So when The Big Bang Theory Season 10 Episode 22 finally gave Sheldon Cooper a line of Hindi to deliver, I got excited. Raj suggests he learn Hindi as a real mental challenge, exactly the kind of moment we expect this show to nail after years of chalkboard equations checked by an actual physicist. He was on set, in the scene, and somehow nobody on a show that ran every equation past a real physicist thought to run one sentence of dialogue past the one guy in the cast who actually spoke the language.