A minor thing, but I stepped on a nail once. Went pretty deep in, and I threw a fit when my parents pulled it out because I was scared. I have no idea how old I was. I just remember being a little kid, recounting it as something that happened a long time ago, and my older sister went, "please, that never happened".
No idea why she said that. Over the years my memory got hazy and I assumed I'd been telling tales as a kid. Then one day in my 20s, my mom mentioned how pissed she was at dad for dropping that nail in the floor π