[Roccotari Eldandil]

I was sitting in the doorway @ school (working on a group project) and someone tried to get out. I sat up (my friend was tickling me, so I was on my back) and said "You cannot pass!" in my best Gandalf voice. Then I was called a geek, and the world was happy. Incidentally, the poor guy who was trying to exit hung from a tall ledge (think Bridge of Khazad-Dûm) and shouted "Fly, you fools!" a few months earlier.
Two examples in one post! Boy, do I feel special.
I also talk to my horse in Quenya a lot. Of course I've used "my precioussss;" it's quite versatile. I tend to use it when stealing pencils, flip-flops, foot, etc. from my best (and LotR-loving) friend. I need to go re-read the books and write down all the quotable stuff.