Thanks to a very dedicated UFO buff with an ear for catchy tunes, here's a video of just about every (alleged) UFO photo taken between 1870 and 2008:
Now, this is either evidence of a vast alien conspiracy, or the finest collection of flying pie plates and mens' haberdashery in Internet history. Although I will say this: at 2:10 in, there is a photo of the Millennium Falcon. The plot thickens.... Via i09.