I don't think that there's any of us that that hasn't happened to, if everyone is honest about it.
Years ago, I used to love shooting matches, 12 gauge only, 2-2-10 ammo, for the X at 40 yards, and money matches. I was skinned by a guy I sold a Win. model 12 to once. I picked up my Browning and went home, head hung low.
I think we can all have a bad day.