I never left early, only to have the game change around, but there is one time that I regret leaving too soon.
When I was in purchasing, I would get offered a lot of free tickets by the vendors. I usually turned them down, but I did get four tickets to Wrigley Field and took my wife and two small children. As I usually did at these games, when there were two outs in the ninth, we would walk to the nearest exit and watch the last out. When it was made, we would immediately go down the stairs, down Addison to the Church parking lot where I always bought a parking spot. This would allow us to get to out of the lot and down Addison to the Outer Drive before the traffic became unbearable.
On this particular day, we took off as the last out was made and headed down Addison, but as we were still in front of Wrigley, there was suddenly a roar coming from inside. I wondered what it was, but continued to the lot and took off.
This was the day that the Cubs clinched the division, and all the players, including Mark Grace who was wrapped in a towel, came out and made a parade around the field, acknowledging the fans, who (other than me and my family) had refused to leave. I didn't find out about it until I got home and watched the News.