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I may be rancid butter but I'm on your side of the bread.
— E. K. Hornbeck ‧ Inherit the Wind

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker admits to being unpleasant by comparing themselves to rancid butter, then insists they remain an ally. The bread metaphor makes allegiance the decisive point: a flawed companion can still be on your side. The joke balances self-criticism with a claim to loyalty.
Context reviewed