Wikipedia’s description of Charles Barkley’s golf swing must be quoted in full:
Barkley is well known for his fondness of golf. However, his swing is often regarded as one of the most bizarre and broken swings in the sport. Barkley’s swing unravels after he brings his club back. He starts to take it forward then jerks to a stop, throwing his body off balance, before wildly striking at the ball.
You have to see it to believe it: