Many years ago, Dad & I went on holiday to Stoupa in Greece. At the time, it was so far off the beaten track that there were only 2 international flights each week into the local airport, Kalamata. We stayed in an apartment complex of just 6 units.
On arrival, there was a couple sitting on the terrace of the apartment next door to ours; several times during the week, I kept saying that I was sure I had met the man next door before, but couldn't say when. Dad dismissed it saying that he probably resembled someone I had known previously.
At the end of the holiday, the 4 of us were taken to the airport in a taxi & were next to each other in the check in queue. Dad, being ever subtle, said that I'd been going on all week about possibly knowing the guy, seemingly, he'd been saying the same to wife too. It transpired that he was a site manager for the building services arm of the hotel group I worked for & about 4 years earlier, he'd managed the refurbishment of the hotel, at which I was Financial Controller. Every week, he'd been in my office to get the team's expenses reinbursed