In order to promote the Star Wars Force for Change charity sweepstakes, John Boyega did surprise photobombs at Star Wars Celebration earlier this month. Avid fans posing for pictures with a couple of stormtroopers and BB-8 were first shocked and then delighted to find Finn in their finished photo.
Star Wars Force for Change benefits the UNICEF and the Starlight Foundation. You can enter the drawing at Omaze.