Wolverine basically said it.
He gave one example with r/wallstreetbets and the GME saga. He almost gave you another with Elon Musk (who hinted at investing in Bitcoin on his Twitter profile, couple of days before Tesla did).
I’ll add one from the stock market myself:
Nine months ago, I have bought TCS stock at a price per share GBP 14.00 in May 2020.
I’m now up about 300% on that investment.
TCS / Tinkoff Bank is Russian Neobank. Since I’m into payment accounts and payment cards to the point that you could call it a hobby of mine, in May 2020 I heard early word of their expansion into Western Europe (they started in Germany a few months later in 2020) on a rather obscure internet forum thread. There were just a couple of news articles in on niche payment-focused websites back then, and banks aren’t always a great investment. Neither are neobanks, if you can’t get in early through venture capital. But I got curious and read about their aggressive expansion strategy, success in building “ecosystems” around payments and their proven path to profitability.
The company was also valued relatively low. In addition to the overall market beatdown by the evolving COVID-19 crisis, its stock had been dogged by recent news about its founder and (formerly) majority owner Oleg Tinkov: He had just been charged by the U.S. DoJ for tax evasion - only a day before announcing he was battling acute leukemia.
Moral of the story? It’s what Wolverine described:
It would of course be easy to invest five dozens of stocks and then rationalise my decision for the biggest winner with the benefit of hindsight. But that’s not the case here.
I honestly haven’t had many other (singular) investment ideas with high conviction since then.
Only Bitcoin, where I’m also up by more than 300%, since getting into it after last year’s halving.
Sadly I haven’t had the balls to act and bet big on them. 
I only invested tiny amounts.