The Marvelous Misadventures of Flapjack (2008)

S1E16 Knot Funny

Captain K'nuckles thinks he has inadvertently put a curse on Flapjack, rendering him mute. In his quest to reverse this supposed spell, he searches for a remedy. However, he soon uncovers that Flapjack is merely pretending to be silent in order to sneak away to the nearby Knot Festival.