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One purpose of photographs is to take a fleeting moment that would otherwise last only a second and immortalize it. Capturing precious moments on film has been an art form for decades. More recently, bloggers and internet lovers have made a new art -- or sport -- out of taking or finding the funniest picture possible. For that particular day, at least.

More often than not, the funniest pictures are the ones that were not intended to be funny at all. An unknowing subject, a clever and mischievous participant and a photographer are the perfect combination for a hilarious moment that will last forever: AKA, a photobomb. Sometimes, the unknowing subject isn't necessary at all -- a lot of things can happen when you're not looking. Here are 25 great photobombs made possible by a little negligence.