Photography seems to be a common ingredient. I will add a story to that list, finishing with a generic lesson.
I went on a liveaboard trip = land to Thailand, and since my wife does not dive, I was a single. It was a group trip out of my dive shop, and they paired me for the two weeks with a roommate--a photographer who was recently divorced. (Hmmm. I wonder why.)
For the first few dives, he put me to good use. He brought two cameras on the dives, and my job was to carry the one he wasn't using at the time. Amazed at the request (more of an order than a request) and trying to be polite, I did it at first, and then I told him I had things to do other than hang around watching him in case he needed to switch cameras. I still got to watch him at work, since we were technically buddies, as he pushed other camera wielders aside to get the shots, after which future shots were ruined by the silt he kicked up.
Then came his greatest act of all. We were on a dive with a very specific plan. We were to follow a DM through a path that would finally bring us to the surface inside a beautiful grotto, filled with stalactites, etc. It was described in the briefing as one of the great dives of the trip. We were in the second of two groups. He took a long, long time at the first photo session, an octopus that was well hidden. Then he spotted something else inside a coral formation--I don't know what. That is where we spent the rest of the dive. Our entire group hovered and hovered and hovered and hovered while he took shot after shot after shot after shot. Our DM was new on the job, and he didn't know how to move him along. When we ran low on air, we went right to the surface, never getting anywhere near the grotto.
Back on the boat, he was raving about what a great dive it was because of how many great shots (over 140) he he gotten. I said I had really wanted to see the grotto. He scoffed, saying it was a lot better to look at sea life than rocks. Fortunately, the skipper had gotten the word, and he gave the guy a great deal--the two of them would go off on their own from then on, looking for special shots. He thought that was great, not realizing the skipper was doing it to keep him from ruining the dives for everyone else.
A couple years later, I went into the dive shop and there he was. trying to interest people in buying his photographs. When we talked, he had no memory of being my roommate for two weeks, and I certainly did not assist his memory.
Generic Lesson: It did not have to be a photography story. It could have been the guy smoking the big fat cigar under the no smoking sign at Grand Cayman. It did not have to be scuba. It is the people who go through life thinking that what is important for them is what should be important for everyone. Their needs and preferences are all that matter. They have no idea that they are imposing on anyone else because they don't care about anyone else, just as my photographer had no memory of someone who roomed with him for two weeks.