I guess possibly twice? The first time in a round-a-bout way maybe, definitely a drastic increase in quality of life. I was dating someone who was a meth and weed user, pretty bad about it. Anyway, she
seemed to handle it most the time, and she knew I fucking hated it as we'd fought about it before. Well, one night she calls me and tells me she's too fucked up to drive, she's about 10 minutes from her house but she's too scared to drive. I drive my happy ass an hour down to her, she gets in my car, and I stay the night at her place, lots of crying and comforting, and drive her to her truck the next morning after we'd been up all night, driving around or just parked somewhere talking. Well, later on we break up for other reasons, I move on(and actually meet my wife about two weeks after the break up), she goes back to an ex.
Fast forward about a year later. She contacts me and tells me that after we broke up, she was cheated on by her ex, again, several times, and then had a nasty string of cheaters after that. This led to her getting clean, getting a good job, and swearing off men for awhile all because, first, of the absolute look of horror and pain I showed when she first got into my car that night that had haunted her ever since, and she knew she didn't have to settle for shitheads anymore after being with someone as amazing as me and she needed to clean herself up if she wanted to find another person like me(her words, not mine). I still get a message from her every 6 months to a year or so(usually on a sobriety anniversary) letting me know how she's doing and thanking me again for being amazing. So I guess you could say I saved someone and turned their life around just from being so damn awesome.
Second time, possibly. I slept in when I should have gotten up for PT. It's a good thing I did. About 5 minutes after I would have normally left, someone started to break into my apartment. I grabbed my gun, stood in the hallway(gun just out of view), and as the door flung open he was met with a very loud "WHO THE
FUCK ARE YOU?!" I don't think he expected anyone and was startled. He started to say something, but then bolted instead. My wife was very glad I didn't wake up early that day.