During a discussion about Proposition 19 on Bill Maher's HBO show "Real Time" last night, Zach Galifianakis commented that the people's opposition to marijuana legalization might be rooted in a feeling that smoking marijuana is still taboo. He then shocked the panel and delighted the audience by pulling out a joint and lighting up on the set.He passed it to one of the stunned panelists, who smelled it, and seemed to confirm that it was indeed the real stuff.