Nope i have only ever done that once and i learnt my lesson. It was the season after we were relegated to what was then called Div 2, we had walked the season with wins everywhere but as the season came to a end we started to drop points. We were away at Mansfield and we had dropped to third in the table, it was tinkling down with rain, the pitch was a mud heap and it was a open end so we were drenched. We were struggling and Daines ( keeper) had made two really bad mistakes and we were 3-2 down with only a couple of minutes to go.
I was with my Old lady and said i have had enough and we left the ground, just has we left i heard the Spurs scream in delight ( it turned out that we had equalised ), the pigs would not let me back in the ground so i climbed a lamp post to see what was going on, i just about reached the top and could see our fans going mad i punched the air and as i did i fell off the lamp post and ended up having to drive home with a busted hand.
That was the first and last time i have ever left a ground early.