The Pistons vs. Timberwolves game turned into fight night on Sunday ... with both sides getting into a massive brawl that flooded into the stands -- leading to a whopping seven ejections.
The chaos broke out in the second quarter ... when tensions were already high after Pistons big man Isaiah Stewart got T'd up for bumping Wolves guard Donte DiVincenzo.
Shortly after, Detroit's Ron Holland slapped the ball out of Minnesota forward Naz Reid's hands as he was driving the lane -- who responded by getting in his face and waving his finger.