I remember reading about a guy who took a .380auto round to the forehead from a fairly close distance and the projectile ultimately failed to penetrate his skull and reportedly bounced off. But I'm sure the flesh wound bled like crazy.
My dad has repeatedly told the story over the years about a friend of his:
The friend and another guy apparently got into a fight with a couple of dudes at a bar in Southern California in the 1960s. Anyway, the friend and his other buddy ended up working over one of the dudes pretty badly.
As my dad's friend and the other buddy jump into a car to leave before the police arrive, the dude they just worked over stumbles up and sticks a J-frame .38 against the buddy's head through the open window. The buddy looked over at the guy and said "You don't have the balls", and promptly gets shot point blank in the forehead. The bullet apparently deflected off the skull and traveled under the skin and around the skull for several inches, before exiting and then hitting my dad's friend just below the collar bone. The bullet still had enough energy to penetrate an inch or so. The buddy suffered a burn and a huge laceration to his forehead, but otherwise survived without issue.
Some of dad's stories have been exaggerated over the decades, but that particular story hasn't changed a bit in the 40 years I've heard it.
Occasionally I'll pocket carry a 637 when I have no other options...and I always remember that story when I put the gun in my shorts.