It would be interesting to know how he flipped the golf cart. It’s not easy to do. I’ve almost done it a few times myself with sharp turns on an incline.
Here at Jurassic Park, we have had several incidents where golf carts were driven into lagoons after medical emergencies. And a few after adult beverages.
My guess is that the driver had the wheel turned and hit the accelerator hard. That is the kind of mishap that occurs when your reflexes and judgement are 83 years old.