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.

"I was getting in too much trouble with the drink and stuff," he explained.

According to Galifianakis, his "rock bottom" incident began with a Jaguar cutting him off as he was attempting to walk home and ended with the actor hurling a beer bottle at the car after its owner spit in his face.