I got my first computer when I was 10 years old and it was running windows XP. Coming from a less wealthy family I definitely tried my best to keep it in good shape. One of my fondest memories is that one day I was messing around with keyboard shortcuts and I managed to rotate the screen 90 degrees.
I left my screen like that for at least 6 months before I figured out how to turn back to the default screen position because I was to scared to mess with any more settings.