Morris the cat and Duke the dog were talking with each other.
Morris: "What's up Duke? You look like you're in pain."
Duke: "Mmm er mmme errmmm."

Morris: "What'd you say? I can't understand you."

Duke (pointing off to the side): "Uhhhhh mmmm eeeeerrrrruf."

Morris then looks off to the side where he sees his cousin Felix running away with something hanging out of his mouth.

Duke (still pointing): "Thhhhh eeee rrrrrrf uuuhh!"

Morris: "Oh, I get it. Cat got your tongue huh?"