Yup. You're describing flashbulb memories.
I’ve taken a lot of courses in noticing and remembering things. One of the best ones was at a Mass Criminal Justice training academy. To say it started out with a bang would be an understatement.
Summertime. We’re on lunch, sitting outside in the shade on a low hill in front of some trees, eating sandwiches and shooting the breeze.
A car pulls up. Two men and a woman get out. She’s extremely attractive and wearing a really short skirt and a low cut blouse.
She leans back into the car and gives us a show.
The men suddenly pull out folding stock, Uzi carbines with extended magazines and open fire on full auto. (They’re shooting blanks)
We scatter into the trees. One guy soiled himself. Me, I was far too scared to poop.
The two guys and gal jump back into their car and speed away.
Over a bullhorn an instructor says “It was a drill, get back where you were, please.”
We come back, shaken up pretty bad, babbling to each other and laughing.
The instructor gives us a clipboard with a sheet of paper and a pen. And starts asking us questions.
What color was the car? What make and model?
Anybody get the plate number, its rear plate was facing you.
How many men were there?
What were they wearing?
What color was their hair?
What was their complication?
What kind of weapons did they have?
How tall were they, how were they built?
Which way did the car go when it screamed out of the parking lot?
We failed miserably. I did offer a little humor after he grilled us. I said “I can tell you what color underwear the woman had on, if that’s any help, sir.”
That drill started a day and a half long course on noticing things, remembering them for safety, for your reports and for court if necessary.