Even hippies become grumpy old men. Last night, Bob Weir, founding member of the Grateful Dead, walked off stage after the crowd was talking too loud during his intimate acoustic set with Jason Crosby (~05:30). The set was part of Weir's Ratdog Quartet show at the Sweetwater Music Hall in Mill Valley, CA. He walked off stage grumbling that he'd back with an electric band and upon returning stated, "We are not going to try anything too delicate."
Weir had a second outburst during his acoustic encore, "Knockin on Heaven's Door," where he yelled "Shut the f*ck up!" to the crowd (~1:00).
Source: Hidden Track
Edit: 3/7/2013 - We found an even better video of Weir shouting STFU!