What do you call it when someone jumps into a picture that wasent invited?

When someone jumps into a picture uninvited, it’s often referred to as "photo-bombing." This playful act typically involves an individual suddenly appearing in the frame, often with the intent of being humorous or making a silly face. Photo-bombing can add an unexpected twist to a photo, but it can also be seen as disruptive if the original subjects did not want the interruption.