Lampshaped in the The Dresden Files. The hero, Harry Dresden, tends to get very much beat up over the course of a book. He's been shot, bitten, had bones broken, intentionally wrecked, near explosions, tossed around by supernatural powerful creatures, burned, frozen, and almost dissected while he was still alive. Thanks to Functional Magic, he recovers from these — slowly, but he still continues to heal (at a normal human rate), until a wound's traces have gone away. Despite his injuries (he comments there are phonebooks smaller than his medical file, when he sees a doctor struggle to lift it), Harry has never broken his skull. He says he thinks someone snuck in and did an adamantium bone-coating on his skull somehow.
Though I walk through the valley of the shadow of trauma, I will fear no concussion.