[KETHERCORTEX]

That's a great way to drive someone insane.

1. Put some of the forbidden symbols in the file names of, let's say, a bunch of photos.

2. ZIP them

3. Send to someone who ordered those photos with Windows/Linux computer.

4. An hour later tell them that everything works on your computer and you don't see the problem. As a bonus you can film unpacking the zip file and saying: "You see, it works. There's something wrong with your computer".