Samuel L. Jackson on The Mountaintop, Attending MLK Jr.'s Funeral and His Crack Addiction on Letterman

In the midst of previews for The Mountaintop, Samuel L. Jackson ventured over to the Late Show with David Letterman on September 30 for a long and revealing chat. Jackson discussed the excitement of playing Martin Luther King Jr. and recalled attending his funeral as a college student. The conversation turned serious as Jackson delved into past as a crack addict past and how he finally got clean. The star lightened things up with a hilarious Marlon Brando impersonation and a shout-out to his cult classic film Snakes on a Plane. Take a look below!