I'm a scrollin' fool.
I wore out the scroll-wheel mechanism on my mouse. I've never done this before, but it's not surprising it happened because the main bodily movement I make at my PC is rolling the scroll-wheel with my right index finger. I scroll constantly and rapidly. To have scrolling suddenly taken away is like having someone steal your crack stash and all the dealers are out of town. OK, it's not like that at all, but it's really annoying.