If your dresser is covered in crystals and shiny stones that you pretend are either materia or magic spheres.
If you pretend that your Robin Hood hat is a Red Mage hat.
If you try to practice Tifa's Limit Breaks at karate.
If you try to practice Cloud's Limit Breaks with a lightsaber.
If you really want a Moogle stuffie.
If you peruse your Nintendo Power issues for even tiny sections on Final Fantasy.
If you play the FF rhythm game so much that you have around 20,000 rhythmia.
Well, hello, Space Warrior! Fancy seeing you here! 
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Quote:
A memory is something that has to be consciously recalled, right? That's why sometimes it can be mistaken and a different thing. But it's different from a memory locked deep within your heart. Words aren't the only way to tell someone how you feel.” Tifa Lockheart, Final Fantasy VII