Of course, anyone can say that he or she is the biggest fan. So let's decide it on how much BTTF related merchandise you have in your possesion, along with how many times you've seen the BTTF trilogy (more or less).
BTTF Stuff you have : Blu-Ray box, MJF toothbrush, etc..
Watching BTTF trilogy: 30 times (doesn't have to be precise, but be honest!)
I'm pretty sure I'm not the biggest fan, because I only have the Blu-ray box and saw the trilogy a mere 20 times. I'm a HUGE fan though, but certainly not the biggest.
So who is it going to be, Martin McFly? Or will it be Michael J Fox is Canadian? Or maybe doodo! ?
Edit: And the winner is... smallo! Most merchandise with photo's to proof it AND he is not even twenty. Enough said!