Like many others, saving and living below your means.
But also, my cat!
Yes, around 1983 I had a small villa and a cat. My cat became jealous of my boyfriend (now DH) and peed on the carpet at the entrance as you walk in. Cheapie place, no tile entrance.
So I had to rip it up and replace it. I was into decorating and plants but tried my first DIY. Went to Home Depot, bought some tile, grout, etc and put it in (maybe only a 3 X 5 area but I was proud of myself!) . Kept going back to HD for stuff and thought wow, this place is really packed on a Saturday morning.
Bought my first "real house" in 1987. Scraped together $600 for an IRA. Bought HD stock (either 30 shares at $20 or 20 shares at $30). Watched it go up and up and kept adding more and more. It split several times.
In fact, once it went down a ton, saw it in the newspaper, way before internet. I called their home office in Atlanta and asked why. I was transferred and the lady answered, "Mr Marcus' office." They had transferred me to the CEO's office!! She assured me that it was just another split.
So I accumulated a decent amount, got chicken before the DOW hit 5000 in the mid 90s and sold most for probably index-fund type things.
So if it wasn't for my cat, I maybe would not have found Home Depot stock early on. Not a home run but a nice amount.