It’s standard practice to ask people how they like their neckline shaped when I’m done with their haircut. Most people don’t care. Usually they say “just do whatever they did last time,” so I tend to do whatever looks more natural.
I had one man that normally had a straight / squared neckline. When I asked him if he wanted to stick with that, he said “You know what? It’s a new year. Let’s shake it up. Let’s go round this time!” I thought it was said in jest, as we often joke about how nobody will recognize you if your neckline is shaped differently, but he was serious. So I made it round.
When I showed him in the mirror, he was genuinely excited about it. “Yeah! I like it. I like it a lot! I think I’ll stick with this!” He kept admiring the back of his head in the mirror while I finished up. He was like a kid on Christmas morning, except his present was a slightly different haircut. I never knew such a small change could make such a large difference in attitude.