Popeye was interrupted by the bull while preparing to fist the gentleman stuck in the tree. You see, Popeye gets a sexual thrill from inflicting pain via anal penetration, which is why he built his forearm muscles to the extent that he did. He wants the men and women he anally fists to know they are being fisted by Popeye the Sailor Man. While engaging in (what he considers to be) the act of love with anyone who can handle it, he prefers to insert his arm up to the elbow, and then ingest a can of spinach, thereby engorging his muscles--often into the shape of a battleship or tank--while still inserted into his partner. This predictably elicits a fair amount of screams of both agony and ecstasy from said partner, in response to which Popeye pleasures himself with his free hand, while repeating the phrase, "I am what I am."