Patient: Toad The Wind in the Willows : Season 2 Episode 6

Toad comes down with a minor cold, but begins to think it something much more serious after he realizes that all his ancestors died young. He searches what he thinks are his father's medical books and realizes that he has come down with a fatal combination of diseases (specifically, armillaria mellea, botrytis, and ranunculus repens). While Rat and Mole diligently wait on the seemingly-dying Toad, Badger searches the books and discovers that Toad's diseases are actually plant ailments. When informed of this, Toad leaps out of bed in happiness, only to fall down the stairs and break his leg.