Lots of times, yes. Most of them were unexpected circumstances. I remember I was at the gas station to buy a kerosene for camping and I got this couple wherein the pregnant wife fainted, I was barely 13, I think it just instinct that help me save the wife. The husband, now an attorney, recalls the story and remember me well.
In scuba diving - twice. First one when I'm on vacation with friends-it was a drunk guy who took a plunge. Second time when I'm training for my rescue diving-it was an accident with another diver who got stuck with an abandon fish net underwater.
And there are lots of other stories. I thank God that all of them were OK.