Had roofers redo the roof awhile ago. I checked the lawn for errent nails thinking I'd find none or two. It went from mildy to infuriating.
I've tried to subtly and not so subtly hint to the electrician that I'm using on my jobs that the tiny cut-offs of wire he leaves after laying on the floor instead of picking them up might not seem like a big deal to him but the last thing the customer remembers is having to clean after them and it's not a good long-term business strategy.