The closest I've ever come to getting into a fight was 10+ years ago coming out of a bar called The Goose in Bellevue, WA. I was there with two friends, shooting darts. We'd been there about an hour when three younger, and obviously drunk guys came in and starting shooting darts a couple of boards away.
We went to leave about a half hour later...never said anything to these three guys, never even looked their way.
I went out the door first, then my two buddies. As soon as we're outside the three young guys come out the door and start swinging. I'm halfway across the parking lot and the bigger of the three makes his way over...I think he may have under-estimated my size (6'7" and ~250#, back then) because once he got close enough to size me up he stopped cold.
Friend #1 was holding his own so on to friend #2's aid I went, who was getting hit hard. Grabbed the guy by the neck and tossed him down. Friend #1's opponent just sort of gave up after that.
I never threw a punch so I guess it wasn't really a fight, for me at least.