Jimmy Fallon and Jennifer Aniston got in each other’s heads on The Tonight Show Wednesday night, swapping mouths for a goofy new installment of the recurring Lip Flip segment. The pair took turns gabbing as one another, with Fallon’s lips first making Aniston talk like Sling Blade-era Billy Bob Thornton and the most amped, obnoxious Bonnaroo attendee. Aniston took a simpler route, turning Fallon into a sweet Southern belle. Her impression was cut short, however, by a near-fatal sneeze attack, which she played off as just a hairball. Though “Lip Flip” showed off Aniston’s sharp comedic chops, the actress is currently starring in the far more dramatic Cake, in which she plays a Los Angeles divorcee with a painkiller habit.