Overhead today

I was walking by three men at lunch today and they were sitting on a wall talking. This is what I heard:

"95% of the time you will win the fight if you throw the first punch, instead of yapping your mouth"

I thought, there are statistics for this kind of thing? Had the speaker been in 100 bar fights, 95 of which he had thrown the first punch and won and lost the other 5 cause he was yapping his pie hole?

That led me to start thinking, is this just about bar fights or does it apply to officially sanctioned boxing matches as well. I could not really find any scientific data to back up this statement, but I did find out that there are a lot of boxers named Oscar.