It's officially September, which means it's officially time to start brainstorming potential Halloween costumes. If you want to do a couples costume or a group costume with your friends, but you want to make sure it's a little more creative than usual, why not dress up as the most iconic enemies from movies and TV this year? From superheroes with beef to Blake Lively and a great white shark, we've rounded up 2016's biggest onscreen feuds that will make excellent costumes.