19. Mark Cuban
The Dallas Mavericks owner is as volatile a character as they come. He is also incredibly prone to temper tantrums when things don’t go his way. Unlike other sports franchise owners, Cuban doesn’t just sit there in a suit and tie in silence. He is unapologetically a fan of his team and makes his opinions known. This rubs some people up the wrong way but there’s no doubting its authenticity.

Meanwhile, it has provided moments of hilarity. One game against the San Antonio Spurs especially infuriated Cuban. His reaction was to take out his anger on an innocent jug of Gatorade. Meanwhile, his unfiltered comments have seen the NBA hit him with millions of dollars worth of fines. Cuban may be controversial, but never boring. Not many owners can say that.