Zach Galifianakis on Bill Maher's Show

Zach Galifianakis will apparently go to great lengths to prove a point.

In a heated discussion on Real Time with Bill Maher about California Proposition 19, which would legalize marijuana if passed, the 41-year-old Hangover star lit a joint on air.

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"I have to agree it's a tricky thing politically to jump on that bandwagon because I think that maybe people see it as taboo still," Galifianakis said about the substance before lighting up in front of Maher as well as three other guests. He then passed the joint to Fox News commentator Margaret Hoover, who confirmed that it was the real thing.

After appearing to inhale some of the smoke, Galifianakis interrupted the conversation, shouting, "Oh my God, look at those dragons!" to further prove his point about some common misconceptions about the substance.

Watch the video here: