Boston Celtics fans root for a franchise that is unlike almost any other in major American sports.
Several teams have experienced a comparable level of dominance to that of the great 1960s, 1980s and late 2000s Celtics' teams. The New York Yankees, Pittsburgh Steelers, Dallas Cowboys and Montreal Canadiens have all enjoyed extended runs as the preeminent teams in their respective sports.
There are also plenty of teams that have scuffled through year after year of mediocrity like the Celtics from the early 90s up through the 2006 season. The Chicago Cubs, Boston Red Sox, Cincinnati Bengals and essentially every Cleveland team have been through a decade or more of irrelevance at some point, with fans able to do little more than dream about a championship run for their hometown squad.
Very few fanbases have experienced both of these extremes to the same extent as Celtics fans.
Through all of these peaks and valleys, fans of the Green have stayed faithful to a franchise that has brought home more titles (17) than any other team in the NBA.
In the following slides, I'll outline my reasons for believing that, on a whole, Celtics fans are the best in the NBA.