You would probably think a franchise as storied as the Boston Celtics would possess a history littered with the dust of NBA Playoff sweeps.
And you'd be wrong if you did, as such a feat -- even against weak playoff teams -- is rare, even for Boston. Across the league, there have never been more than six sweeps in a postseason save for 1989 (a massive outlier with nine such series), and most postseasons have had just one or two over the entire postseason.