Interestingly enough the reason any human would have those dimples in that brain region is because that area was worked throughout one's lifetime, not because of geniality. If Newton were born a slave he'd have the same thing.
This is the next scene; and Leonardo actually did cut his hand on a glass but he didn't stop acting, he screamed in pain and used it to enhance his performance:
That was real blood.
Originally posted by Oneness
YouTube video
Brad Pitt, still a ripped pimper.