When your OS goes crazy - Screenshots

[Kaius]

Here's one:

This happened when I accidentally tried to boot a full GRUB .iso image as a kernel in Qemu. Took me longer than I'd care to admit to figure out what was causing it

[NotYourFox]

I have a problem with old (24 y.o.) hardware. When I try to scroll in VESA (using fast memcpy), it starts the simulation of a broken display (color flooding and occasional strips). Just on this one, and only with my OS.
Can't really take a screenshot of it though, unfortunately

[EmanueleDavalli]

Some years ago, when I tried to write a native driver for the Intel integrated GPU of my old PC.
I was accidentally writing in text mode (0xb8000) after modesetting (or viceversa writing in the framebuffer while still in text mode, my memory of this particular bug is fuzzy)