My advice for when anyone watches Pirates of the Caribbean 3: At World's end is to wait for the final scene once the credits finish. Then go to this website and understand it:

http://en.wikipedia.org/wiki/Will_Turner

I thought the movie was AWESOME. It really connected with the first two that is, if you're a manic Pirate fan like me. :) The ending is unexpected but really great. Watch it because I rate 5/5.