I once took my parents somewhere for what I thought was the first time. This was a place close to my heart and related to my work. They both insisted I’d taken them there before; I countered that this was impossible, as I would surely remember given that I had a connection to the place and they didn’t. They then took out their phones and found a photo of us all in that same spot a few years earlier. I still couldn’t believe it, but I had to, because the proof was staring at me.
The point is our minds can and do play tricks on us, sometimes very surprising ones.