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Season 2, "Comeback"
We don't mind Coach Sue showing us her softer side — but only when it includes her sister or Becky, and never for too long. So it was painful to sit through her visit to the children's hospital with Mr. Schuester and his ukulele, and then having her join New Directions in a weirdly lifeless rendition of My Chemical Romance's not-even-that-great-to-begin-with "Sing!" Just... no.