Yeah, like the millions of other posts about crap that this isn't the site for aren't doing the same thing, yet still hitting the front page

Go watch Red vs Blue

Personally I liked my Slooper Ninbendo

I saw something similar to what daud_ici commented, I didn't watch very much but what I did see said that the actor who played Darth Vader didn't know the line to say "I am your father" until just before they shot the scene, and at that point only Lucas, Spielberg, and the actor for Darth Vader knew that was coming. It was in filming that scene that Mark Hamilton found out, but it didn't say anything of adding it in afterwards.