When was the last time you saw an NBA player forcibly knocked to the ground after going up for a lay-up or dunk? It rarely happens nowadays. But back in Bill Laimbeer’s playing days, it was comically commonplace. That was an era when the NBA game was a lot more physical. Such physicality is outlawed in today’s game. The Celtics played a physical game, which the Pistons picked up on and took it to another level, which eventually led to that style being phased out of the game.