What job, when done right, does no one notice, but the moment it's done wrong someone immediately points it out?

The answers can be as silly and creative or as serious as you’d like them to be.

My contribution is: the dishes. Everyone seems to know how to do them the “right” way, so if you wander off their path, they have no problem telling you how you could have done a better job. This is why I prefer to do the dishes with no one else around, because I, like everyone else in the world, prefer to do the dishes my way. :D