When Leia told Han Solo, "I love you" in The Empire Strikes Back, he was supposed to reply: "I love you, too." Instead, Harrison Ford improvised the now famous line: "I know." Jack and Karen's characters on Will & Grace were originally not supposed to be friends at all, but producers noticed Sean Hayes and Megan Mullally's chemistry. After finding out that she would have to be naked in front of Leonardo DiCaprio in Titanic, Kate Winslet decided to break the ice by flashing him upon their first meeting. Katherine Hepburn has won more Best Actress Oscars than any other actress in history. (Four, to be exact.) To prep for Fantastic Beasts and Where to Find Them, actors went to "wand boot camp" where they learned how to wield and move wands. Tatum O'Neal, who won a Best Actress Oscar for Paper Moon in 1974 at age 10, is the youngest Best Actress winner of all time.