Shawn: You're not claiming Grimace as a brother.
Gus: Grimace is a brother.
Shawn: He is an amorphous mass. He's like a big amoeba.
Gus: He's a black amoeba, Shawn.
Shawn and Gus argue over Grimace, which was a character in McDonald's ads and videos from the 1970s through the early 2000s. (Incidentally, Grimace was, in fact, purple.)