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Well, 'cause you never know if a girl's gonna say yes or if she's gonna laugh in your face and pull out your still-beating heart and crush it into the ground with her heel.
— Xander ‧ Buffy the Vampire Slayer

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker imagines a girl's possible response as either agreement or a spectacularly cruel rejection. A laughing refusal grows into a still-beating heart crushed underfoot. That violent exaggeration gives emotional vulnerability a physical form, making the feared disappointment sound enormous and absurd.
Context reviewed