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?"