I especially like the typography ones.
Whenever you see fog on a forested hillside, you think, nature is making a gaussian blur.
You're sitting in the movie theater watching the movie titles, shaking your head at how badly they're kerned.
Your biggest fear is Papyrus becoming the new Comic Sans.
You know that, by default, if three designs are shown to a client, your least favorite will be chosen – or any combination of worst components of each.
You have an uncanny ability to automatically see when something is lined up properly without the need for tools or devices, for instance if a shelf is straight, and where the center of the wall is to hang a picture.