I apologize if this isn't 100% within the rules, but this is my strongest memory.

This is the first "screenshot" I ever took way back in Beta Phase 3.



Here's what I wrote about it at the time:
This is the moment when I really got that "Oh my GOSH! I'm playing ARR!!"

My Character, Cutie Mcsnuggles, finally made it from Gridania to Ul'dah after about 2 hours of trying and 3 or 4 deaths. I met up with a group of people around my level who were also making their way to Ul'dah and they let me tag along. So about 20 or so hours in, this is the moment that I will remember forever.
Ul'dah has been my home ever since.

Character: Cutie Mcsnuggles
Server: Masamune
Item: Mandragora choker