David Letterman Explains Why 'Spring Breakers' Director Harmony Korine Was Banned From His Show [VIDEO]

'Spring Breakers' director Harmony Korine is a bit of an enigma. His movie 'Gummo' is still a controversial subject among film critics, as is his dabbling in illicit substances. Now, David Letterman has explained why Korine was banned from his program more than a decade ago.