Photobombing is an esteemed form of pranking, that's existed for about as long as humans have been taking photos of each other. A true work of art, the perfect photobomb can transform even the most boring photo into a hilarous masterpiece. Traditionally, a photobomb will be performed on purpose by a mischevious prankster, intent on transforming the original intention of an image. Photobombing is inclusive by its nature though, and it can happen in many forms. The accidental photobomb can be just as hilarious as any that's been planned, and many classics have emerged from an unsuspecting person stepping in front of the camera. Without a doubt though, animals are the masters of photobombing. Ever since a certain marine creature swam its way into a photo back in 2009, photobombing has become a household term, receiving media attention worldwide. Considering how good some of the animal-related photobombs have turned out, it's easy to suspect just how much animals are aware of our silly human activities. We've scoured the internet for the best of the best, in order to bring you the funniest photobombs throughout history. From creepy pranksters in the shadows to inadvertent lens blocking, this list takes a look at the 25 greatest photobombs of all time.