Up until now, we had a narrow view of what constituted a photobomb. We always thought you had to actually see the 'bomber in question, but we were wrong. Sometimes, a photobomb is all about the reaction of the 'bombee.
Case in point, this pic, described by Redditor roomiccube as, "A wasp flew into my friend's photo."
Obviously, we're all agreed that the photo has been successfully bombed, whether you can spot the wasp or not.