Sometimes we take things for granted as developers. The Web is a magical place when you know how the magic works. There are plenty of people we work closely with that may not have that understanding.
Have you ever done something that felt simple, but seemed magical to someone that hasn't written code?
I can remember multiples that I've opened up dev tools in a browser and made an adjustment to something live next to a client and had their eyes widen in surprise. What sorts of things have you done that surprise non-coders?