What was your “aha” moment that made you start investing seriously?

I was just reflecting on this the other day and realized there was a clear one for me, when the market had a good day and my portfolio went up by more than my monthly rent. That for some reason really stuck with me.

As my portfolio grew more, I have had even bigger days but that moment stands out. It made me realize "ok, we are onto something here."

Has there been a moment like this for you?