I day traded with the first money I ever got out of college back in the late 90s, and once had about $8,000 in Amazon stock when the market cap hit 2.5B and I freaked out and sold, counting myself lucky to have locked in a 30% gain. Oops.
My kids like to remind me if I'd started buying Amazon stock when I first started complaining about having sold too early, I'd be rich now.