Yesterday I was doing some programming and I noticed that the numpad didn't work. Later I saw the mouse move when I pressed some keys in the numpad. I could control the mouse with my keyboard! Cool, but very unnecessary. I want to use my numpad as numpad and nothing else, dah.

After some googling I found a key combination to turn this feature(?) on and off. Alt + Shift + Numlock.

I just have to figure out how I hit that combination by accident...