This is just an observation -- but one I find curious.  I've seen it a lot over the last few years and it puzzles me:

The Celtics seem to suffer significant periods (sometimes a whole quarter, occasionally almost an entire half) when the whole team can't throw the ball in the ocean.  Not just a couple of players, but the whole team misses threes, two, layups, breakaways, dunks -- we saw it for a good part of the third quarter last night.

I know that just statistically this should happen every now and then, but with so many scorers on the team, I don't get how it happens as frequently as it has.