This story isn't strictly about eyewitness testimony and remembering events but it does tell me that what one thinks one sees and what actually happened can very different.
My wife stayed up later than me and the next morning told me she had an unnerving experience when she saw flashes of light — like a camera flashing — coming from the woods behind our house. I asked her to wake me up if he flashes returned and I was asleep.
The next night, the flashing was back and she got me. I stood at the closed back door and there were flashes of light coming from the woods at random intervals. I watched very carefully but couldn't spot the point source of the flashing.
Finally I went out on the deck and into the screened room at one side of the deck. If there was someone out there, I reasoned that I didn't want to be a target. The next flash seemed to come from behind me. WTF! I turned and looked at the surrounding houses to see if some household's Halloween decorations were misfiring. While turned facing the house, there was another flash but was coming from inside the house in the dark kitchen. There is a window in the side of the screened room with a direct line-of-sight to the kitchen. Later I discovered that my wife did not appreciate the suspense/horror trope, "It's inside the house".
The kitchen has high ceilings with four recessed dimmable LED lights. I was looking around and noticed what looked like a very faint green glowing dot in one of the lights. I was wondering about the glow when, POW!, it was like a strobe light went off in my face.
I discovered that the ceiling lights had not been turned off but set to maximum dimness. For some reason, this caused one of the lights to randomly strobe. Turning off the light fixed the problem.
Here's my take-away. Both my wife and I were certain that the flashes were coming from the woods. I would have signed a sworn statement to that effect. It wasn't until I left the house to observe from a different angle that the true source of the light was discovered.
You might wonder how we could not see that the source was inside the house. The combination of recessed lighting, ceiling height, and position of doorways resulted in a dispersed flood of light rather than a point source as you would see if you fired a flash directly toward a window. When the light strobed it reflect back into the house as if the light was coming from outside. All it took was a change in perspective to identify what was really happening. I'm just happy that we didn't call the sheriff's department to report someone in the woods.
This event has made me appreciate that, no matter how convinced one is, perception and reality can differ greatly.