... When you're in a movie theater filled with Lord of the Rings fans ...
Stand up halfway through the movie and yell loudly, "Where is Harry Potter?"
Block the entrance to the theater before the movie starts and scream "YOU...SHALL NOT... PASS!"
After the movie, loudly say "Lucas could have done it better."
Finish off every one of Elrond's lines with "Mis..ter Ander-sonnn."
When Aragorn is crowned king, stand up and at the top of your lungs sing, "And I did it.. MY way.!"
Dress up as old ladies and reenact "The Battle of Helms Deep," Monty Python style.
When the Ents decide to march to war, stand up and shout, "RUN FOREST, RUN!"
When they go in the paths of the dead, wait for a tense moment and shout, "I see dead people!"
Refer to yourself in the plural and call your popcorn "My Precious."
Refer to yourself in the plural and call your neighbor's popcorn "My Precious."