In December 1996 Gregg Popovich pulled off the ultimate NBA inside job as general manager of the San Antonio Spurs, he fired unaccomplished head coach Bob Hill and hired himself. A decision which influenced the trajectory of the NBA for the next 20 years and began a continually simmering dynasty.
Since Popovich's decision in the 1996 - 1997 season 84 NBA head coaches have been swapped during an NBA season. It's a hell of a list: Kevin McHale, Rick Pitino, John Calipari, Flip Saunders, Jeff Van Gundy, Doc Rivers, John Lucas and Dave Cowens, just to name a few.