Simple explained, you just write a story on how, when and why you got Garry's Mod for the very first time.
Here is mine:
The time before Gmod.
Before I got Garry's Mod, or even KNEW about that game I spend a LOT of time playing Battlefield 2 with the Sandbox mod. I really loved that game and I build some really epic shit that everyone was being jealous of.
Here are two examples of what I was capable of to make:
http://www.youtube.com/watch?v=yCDYiMUyCm4
http://www.youtube.com/watch?v=rVenqEvr0NA
However, as you can see Battlefield 2 has barely any physics at all, so it is more like art work then functional work. But I still loved the game and spend almost just as many hours on it as I do now on Garry's Mod.
One of my friends which played this game with me as well once found out about Garry's Mod and introduced me to it. I literally jizzed in my pants when I saw videos about Garry's Mod and I just HAD to go get it. I searched trough the internet how to download this, and found out about Steam and it's pirate ways to get Garry's Mod, but I still required a source game to play it, so I bought the entire Orangebox. When I received it home, I installed all the games, and started to play Garry's Mod eminently. I didn't even care about games such as Hl2 and Tf2, as I had Garry's Mod, which was everything that counted for me.
My very first contraption.
I can remember very well how I watched tons of videos and tutorials about Garry's Mod, so I basically made contraptions shown on those videos. My very very very first thing I made right after I started up Gmod the first time was a rocket with 5 barrels and a thruster underneath.
Yes, I used this video for that: http://www.youtube.com/watch?v=urwVjmH9noM
Another contraption which I made millions of times was that robot which uses lockers as feet, clocks as legs and an airboat as main body. I can't find that video right now, so I hope you've seen it once yourself and know what I'm talking about.
First time online.
I can't quite remember the first time I went online, but I can sure remember the first time I joined a new server, which since that day I'm friends with the owner even till today. I got admin on that server after a few days, and I really enjoyed playing on it. It was a cracked server, as I still didn't buy Garry's Mod legally.
Finally, I bought it!
After many months enjoying myself on Garry's Mod, I decided to actually buy Garry's Mod legally to find out what this game has to offer more then just Sandbox. I was still playing on my friends server, as the same friend which I used to play Battlefield 2 Sandbox which was also playing on this server, but he didn't bought it legally yet.
The first time in RP and it's communities.
I don't know if my first time was in some kind of DarkRP server, or if it was PERP. I never really got into the entire DarkRP shit as it was boring as hell, and those kids made me cry. Once I met PERP, I was addicted to it and played it all day long as long as I could. While playing PERP, I also played on Kazuo's sandbox server for a while, as I still enjoyed making lots of good contraptions with Kaz, and Journeyman etc. Just before PE died, Kaz turned his sandbox server into an entire community with a forum, called Orange Cosmos. I was admin on it from the nearly beginning as I was admin on his sandbox server as well. Unlucky enough, I was to desperate to get admin on PE, and ruined everything so badly so Kaz demoted me on OC as well. Once PE died, and OC became bigger and bigger, and got more servers such as RE, TTT, and later even GMR. After a long while, OCRP was made and opened for public. I played for a few months but I was still trying to hard to get my admin back. I decided to lay off for a while and just give up on it. After like 2 more months, I saw a lot of players getting admin, so I was kind of jealous, so I tried to get it back one last time, with success!
Now that OC died, I followed many of the regular players to Catalyst Gaming. Now, I continue to enjoy my time here, and we'll see for how long that will take until I move on to something else?
Now, what is your story?