When I was probably 13 years old, I got Duke Nukem 3D. I really wanted to figure out how to build my own levels. I had found other levels online and I couldn't figure it out. My 7th grade teacher made us do was write formal letters as a project for class. So I wrote a snail mail support request to 3D Realms asking for help getting set up with build.exe. They sent me a printed version of the manual, and some troubleshooting tips for the issue I was having.
Now I wonder if it was this guy that resonded...