I saved two people's lives in one day as a teenager.
I was going to meet my cousin for lunch, as she had just started at university in my city and I had recently left school.
First incident: I had just got off the bus and was walking along the street, when I heard a loud clatter.
A homeless man who had been sitting on the steps of a nearby museum and fallen and banged his head - he was knocked unconscious and was bleeding profusely from a head wound.
I moved him into the recovery position, applied a pressure compress to the head wound and shouted at a nearby shopkeeper who had popped their head out to see what had happened to phone an ambulance (this was before the days when it was normal for a teenager to carry a mobile phone).
I stayed with the man until the ambulance arrived and the paramedics said that he could have potentially bled to death, had I not done what I did.
Second incident: I had met my cousin at a pub with a large beer garden and we were sitting outside, enjoying the last of the September sun, when I heard a yell.
A man who had been sitting drinking alone (quite a lot, from what we could see) had tripped, fallen and rolled down the slope of the beer garden. There was a wall at the bottom of the garden and he must have banged his head against it, as he was out cold.
Again, I rushed over to check and realised he was choking on something and struggling to breathe - I opened his mouth and realised that his denture had slipped and fallen to the back of his throat, so I hooked it out with my fingers, moved him into the recovery position and rubbed his back until he re-established his breathing.
(I should add that at this point, everybody else was standing around gawping, until I yelled at a member of the bar staff to call an ambulance.)
I waited with him until the ambulance arrived (he was still unconscious, but breathing normally by that point).
I went home then as I was getting a bit worried that I was the common denominator (!), but to this day, I still can't believe that so many people did nothing and left it up to a fairly young teenage girl to sort out. Thank goodness for my first aid training!
I haven't told many people that story as it sounds so unbelievable, but my cousin and I still laugh about it from time to time.