VIDEO: Hangover Star Zach Galifianakis Reveals Why He Quit Drinking

The Hangover Part III may be hitting theaters next weekend, but the real-life hangovers have ended for star Zach Galifianakis.

During an appearance on Conan this week, Galifianakis told host Conan O'Brien that he quit drinking after a tipsy late-night incident in Manhattan.


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