Attention to detail. Gotta love it.
As part of having my bathroom repainted, I bought new cover plates for the light switches and electrical outlets. The painter put those on in the course of finishing up the job.
This evening I happened to take a closer look at them and realized that, of the four screws holding on one plate and two screws holding on the other, every single one had its screwdriver slot vertical. Only one was even slightly out of plumb.
Now, that's good workmanship.