marduk
quelling chaos since 2352BC
There also needs to be some firm grounding in the human experience.Actually, the first kiss analogy proves the point... just not the one you were trying to make. Sure, you know you kissed her, just as you know you saw something. But people often romanticize that first kiss, and remember it as something more special than it was. Perception and memory are malleable, subjective things. Going even further, while you might think you know what the other person was thinking when you kissed her, you don't. You can say, "I know what she felt" until you're blue in the face, but that's your perception, not hers. We have a great propensity to see or feel what we want to see or feel.
Or take your car accident example. I was in a serious one years ago. There were two of us in the car (we hit a tree). Both of us remembered different things about it, in different ways, even at the time of the accident. That's natural. When I worked with the RCMP I dealt with lots of witnesses who did the same thing, often creating conflicting narratives of the same incident. We're not computers.
I'm not saying you didn't see space aliens. I'm just saying that there's no way you can say for sure that you did. There's a difference between those two positions.
Once, during my divorce years ago, I went for a drive in the north of town on a foggy night. Pulled my car over to the side of the road, got out just to get some air and think.
Suddenly, out of the fog and the dark came some flashing lights, low, silent, in a triangular pattern. I got quite freaked out, they came right at me, low and slow. I thought it was something anomalous for sure. And as it passed overhead, I was suddenly deafened by the commercial airliner coming in to land at YYC. The angle was just perfect that all I could see were the front lights on the plane, not the navigation lights. The fog must have deadened the sound. If I had been even a mile or two away, I might have thought it was a UFO. But I remember that night well, because those kind of emotionally laden experiences are burned in to your memory.
Just like when the Challenger exploded, or I first saw planes hit the twin towers on TV. I can tell you where I was, what I was wearing, who I was with.
But being human, telling you the date, or the day of the week, or the exact sequence of events gets muddled, because that's not how our mind works.