The Tiddle-Me-Wink

S2, E13: A vampire bat is spotted in the woods on the day of the Acorn Tiddlywink Championship. Panic is quelled when it turns out to be Carwash, who was turned into a bat with sensitive ears by Evil Edna, so that Carwash's appalling singing (for the opening ceremony) will hurt his own ears as well as everyone else's.