"Some say revenge is sweet; some say revenge is a dish best served cold. And the bitter barber-turned-chef played by Johnny Depp in Sweeney Todd would probably say revenge is best served in the form of mystery meat between flaky layers of pie crust. However you slice it, revenge is served often at the movies, perhaps never so delectably as in the 20 movies that follow in this gallery. Does Sweeney Todd belong on the menu alongside these films — some of the most visceral, violent, and vindictive vengeance classics in all of cinema? Dig in and see. Just remember: this time, it's personal."