If your Valentine's Day dinner is going to be a fast-food meal for one, Burger King has a deal that might lift your spirits. The chain says customers at four US locations will be able to trade a photo of their ex for a free Whopper, Fox 8 reports. The promotion, a tie-in with new Harley Quinn movie Birds of Prey, will be offered on Feb. 14 at the Burger Kings at 35 Powell Street, San Francisco; 545 N. Victory Blvd., Los Angeles; and 150 Everett Ave., Boston. New Yorkers can get their free Whoppers at the 327 W. 42nd St. Burger King from Feb. 14 to 16. BuzzFeed reports that customers will need to bring a printed photo and put it in a "breakup box." (More Burger King stories.)