Or how about male vs female clients and their insistence of watching over you as you do the work.
Females tend to leave you alone and carry on with whatever they're doing, whereas guys (especially older ones) will helicopter around and watch every step you make. I've had to politely ask a few to move back as they were in my way and making me lose concentration on what I was doing (which also means the job takes longer, and they have to pay more).
I get that sometimes curiosity is why they want to watch, and that's ok especially if they ask beforehand.
I've done the same when the fibre was being ran to my property. I asked the chorus guys if I could watch the fibre blowing process, as I'd never seen it before and was interested to see how it was done. They said no problems at all.