From the director's commentary version of the Land Before Time:
Mr. Thicknose: "As you can clearly see Spike's act of sitting on Petrie is a clear reference to the treatment of the proletariat by his capitalist overlords. The capitalist overlord is represented by Spike, who is indicative of the excesses of the owners of capital..."
Director: "What?"
Mr. Thicknose: "The scene was clearly intended as subtle sociopolitical commentary was it not?"
Director: "Urgh.." (under his breath) "Whose idea was it to hire that blowhard?"