I remember playing QuakeWorld (Quake 1) back in the day. I was about 8 years old, I think? My memory may not serve me perfectly on this, but I remember ending pretty high in the rankings at the end of each match at one point.

Then I got some serious nightmares from it (well, yeah, I was 8) and had to delete it. (by deleting the icon from my desktop... I was so innocent back then)