Oh! You know the story of Percy Bysshe Shelley's heart? I read that some experts are divided on which body part his friend had actually rescued from the fire. The heart is fragile, and the liver less so, and they might look rather similar when charred?

Still, I like the idea that it was his heart. It's romantic, isn't it? Although his liver would've been equally essential to him while he was alive, and no less a part of him.