In this photo taken Monday, Aug. 6, 2012, bartender James Smith delivers a $5 Mai Tai during happy hour at the Roy's restaurant in San Francisco. The concept of happy hour when bars offer lower prices or two-for-one specials seems like a widespread tradition, but is actually illegal or restricted in quite a few places. (AP Photo/Eric Risberg)

Associated Press
In this photo taken Monday, Aug. 6, 2012, bartender James Smith delivers a $5 Mai Tai during happy hour at the Roy's restaurant in San Francisco. The concept of happy hour when bars offer lower prices or two-for-one specials seems like a widespread tradition, but is actually illegal or restricted in quite a few places.  (AP Photo/Eric Risberg)
In this photo taken Monday, Aug. 6, 2012, bartender James Smith delivers a $5 Mai Tai during happy hour at the Roy's restaurant in San Francisco. The concept of happy hour when bars offer lower prices or two-for-one specials seems like a widespread tradition, but is actually illegal or restricted in quite a few places. (AP Photo/Eric Risberg)
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