What is the most discouraging thing you've tried that actually ended up succeeding in?

Recently...trying to start a fire with a knife and flint while everyone said I couldn't do it and laughed at my attempts. I got the last laugh when I DID do it....It took over an hour, but I did it, lol. And NOW I can do it quickly because I've learned about the best things to use for tinder. That was my problem the first time. Yes, it inspired me in a few ways. For one thing, I learned to trust my gut. I wanted to use one thing for tinder and everyone else told me to use something else. In the end, what I wanted to use in the first place is what lit. Secondly, I learned that I'm a stubborn person. Despite bloody knuckles and a bunch of laughing asshats, I was the only one who managed to make a fire. So, it was good and it's an important skill to have.