Not photobombing is not an option.
Perhaps this goes along with our other camera rules (#56 and #26), and it is an important rule nonetheless. It might be an unspoken motto of animals to destroy or make their way into a beautiful shot. When the camera is usually pointed at us critters, I find it hard to believe that you were going to take a picture of something else other than me or an animal. There are many ways to photobomb a picture, it is always best to be creative without being obvious. Just get in that shot and give it your best!