Ask HN: What was your BrandonM moment?

I started browsing HN in 2018 but only recently found out about BrandonM[0]. I'm curious to see if anyone had a BrandonM moment in their life.

For example, maybe you were choosing between working at two startups and made the "wrong" choice. Maybe you had the opportunity to invest in Bitcoin early but didn't take the chance. Maybe you had the opportunity to decide which tech stack to use at a company and made the suboptimal call.

Have you ever held a strong opinion which turned out to be completely wrong.

1. What was it?

2. What was the result?

3. Does it haunt you to this day?

[0] https://news.ycombinator.com/item?id=9224