The Fairly OddParents - Season 3 Episode 16 -

When Timmy is shouted at one too many times, he wishes that everyone would just be quiet for one day. Cosmo and Wanda grant this wish, and soon, Dimmsdale is eliminated of dialogue. However, a meteor is soon about to strike the town, and Timmy cannot undo the wish because no one can hear him, but he manages to wish the sound back by charading it.