Dave the Barbarian (2004)

S1E36 Red Sweater of Courage

Fang decides to boost Dave's courage by having him don the Red Sweat of Courage. However, this backfires spectacularly as Dave becomes excessively brave and ends up offending Chuckles The Silly Piggy, Malsquando, and Quasmire. Enraged by his insults, the three villains join forces with the intent of taking down Udragoth.