S4E21: I Take Thee Quagmire
DOLPHIN 1: Hey, man. I see you got some seaweed on your tail.
DOLPHIN 2: Where? What? Oh!
You know I'm just playing with you.
Man, you are...
Oh, I thought you was talking about other seaweed.
You know I got jokes.
(DOLPHINS LAUGHING) I'm gonna slap you with my fin.