Standup comedy: which live acts have you been surprised by?
Open thread: Following Sarah Silverman's unannounced appearance in London this week, we'd like to hear about the comedians who, good or bad, you've found surprisingAudience members at London's Comedy Store and 99 Club were last night treated to a surprise set by Sarah Silverman, who's currently in the UK to promote A Million Ways to Die in the West. Suprise appearance by @SarahKSilverman last night, awesome! pic.twit…