I have two.
I was chatting to a guy who had an audio company in the early 90s I reckon and he mentioned Bluetooth, which confused me. He raved about this new tech and said he was sure it would be massive.
The other was interviewing a forensic scientist on his retiral from the police. He had been the most senior of his speciality at Lockerbie.
He was explaining transference (Occam’s razor) and I can remember sitting on his couch in his living room in the small village he lived in and saying, “wait, do you mean evidence of me having been in your house is now indelibly here, I’ve left traces?” - totally fascinating.
There started a fascination with crime novels, too.