The misquote has even made it into Star Wars canon. In the radio drama adaptation of The Empire Strikes Back, Vader says, "No, Luke. I am your father," and in Jedi Search by Kevin J. Anderson (1994), Luke remembers Vader saying, "Luke, I am your father." Try using that as your defense the next time you're caught misquoting the line.
"I'll be back" is a catchphrase associated with Arnold Schwarzenegger, which he first used in his role as the title character from the 1984 science fiction film The Terminator. On June 21, 2005, it was chosen as #37 on the American Film Institute list, AFI's 100 Years... 100 Movie Quotes.