When you have an extremely urgent bodily need to jetison waste, and you are in the process of literally running to an establishment to get rid of said waste and you are not sure that you are going to make it before...you know...
Oh dammit i really have to shit, and the nearest toilet is 3 blocks away!!! oh man this is gonna be a photo finish!
As you're about to climax while doing someone from behind, you grab the nearest family photo and ejaculate onto it.
As Ted was banging Patty from behind, he knew it was time to close the deal. He grabbed the nearest framed photo and exploded onto it. The next morning, Ted saw that he had Photo Finished onto a picture of his own sons, Brad and Paul.