The Mask: The Animated Series
Ace Ventura: Near the end of the two-part crossover "The Aceman Cometh"/"Have Mask, Will Travel". In fact, the mask hits Ace's rear end, turning it into a head of its own (exactly like Ace's, but colored in a green hue) - possibly ironizing his gag of making his butt "talk" (as in the "ass a few questions" joke from the original movie).