When an NBA playoff series gets extended to a sixth or seventh game, there is sure to be a number of nasty feeling that develop between the combatants. When those teams are the Miami Heat and the Boston Celtics, who will play a Game 7 on Monday and meet in a decisive showdown for the second consecutive year, that's a guarantee. Jaylen Brown of the Celtics has accused Kyle Lowry of the Heat of being a dirty player.

In the video, Brown came up with a rebound, and after gathering himself and going up for a shot, Lowry took a wild swing with his right arm and appears to make contact with Brown. It did not appear to be a swipe that was designed to block the shot or knock the ball away.

From Brown's perspective, Lowry's swing appeared to be an intent to injure. Jaylen Brown asked the officials to review the action and told Lowry that he is “motherf**king dirty” and that he needs to “watch that s**t.” He also accused Lowry of trying to break his arm.

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The accusation took place in Game 6 of the series, which the Celtics won by a 104-103 margin on Derrick White's miraculous last-second put back. That allowed the Celtics to tie the series at 3-3, and they will attempt to become the first team in NBA history to come all the way back from an 0-3 deficit and win a playoff series.

To this point, 150 teams have been in a 3-0 deficit in the playoffs, and all have failed to achieve the comeback. Three NBA teams prior to the Celtics have managed to force a Game 7, but none were able to bring it home as well.