So this happened.
According to a story published by the San Jose Mercury News, 49ers fans have raised $8,000 to raise this billboard outside Seattle’s CenturyLink Stadium as a jab at the Seahawks.
— NBCSN (@NBCSN) December 18, 2013
NBC Sports’ Mike Florio saw it as a retaliation to Seahawks fans purchasing a brick at the 49ers’ new Levi’s Stadium, and their alleged efforts to raise a “12th Man” flag over Candlestick Park.
Maybe it’s just a case of fans behaving badly.