Indestructible stone.

I've theorized for quite some time now that Keith Richards is somehow invincible. All those drugs, all that booze, there's no way anyone could survive that.

More proof that I'm right - dude fell out of a freaking palm tree (he was picking coconuts - nobody seems to be interested in why he was picking coconuts) and landed on his head, and he's doing just fine.

Now, I love the man - he's one of my favorite guitarists and songwriters. But I'm more convinced than ever that he's not human.