For almost 20 years, the laughs haven't stopped at Punchline. San Francisco's oldest comedy club still presents the country's best comedic acts six nights a week. Robin Williams, Drew Carey, Chris Rock and Ellen DeGeneres all learned the ropes here. Today, big-name comics like Sarah Silverman and Zach Galifianakis have been known to show up unannounced to try out new material.

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