It may have only been two words, but Jennifer Garner’s joke about her ex-husband Ben Affleck sent fans into fits of laughter during the new Deadpool movie, and it seems he wasn’t given a heads-up it was going in. Jennifer Garner and Ben Affleck infamously dated for over a decade after falling in love on the set of Daredevil, where Affleck played the title character, and Garner portrayed Elektra. The movie star reprised her role for the latest Deadpool movie. Speaking on the latest episode of the “Happy, Sad, Confused” podcast with Josh Horowitz, the director of Deadpool, Shawn Levy spoke about…