I have a very clear memory of an incident that I'm told never happened.
I was aged 12, supposed to be keeping an eye on my baby cousin, then looked round to find he was floating face down in my grandmother's lily pond. I ran to get my uncle who was gardening. He leapt in and got the baby out, perfectly unharmed. I got a terrible telling off from my mum and my auntie, the baby's mum for not having jumped in myself to rescue him. I couldn't swim and didn't know how deep it was, so I thought we would both probably drown, better to get his dad.
Many years later I happened to mention it, and my auntie and mum both said I'd imagined it, it never happened. I can't believe that they would ever have forgotten such an incident, so I must have imagined it. But it remains a very clear memory to me. Wierd.
By the way, if you go to the kitchen and can't remember what you went in for, that is quite normal.
If you can't find the way to your own kitchen, that is time to worry.