UFO Sighting in Downtown Seoul, South Korea on April 07th, 2012. This UFO is flying over the Downtown in Seoul. The UFO was caught on tape before the camera fall down. We expect more pictures because hundreds of people must have seen the UFO.

An airplane passenger videoed a mysterious oval white object flying over Seoul, South Korea, April 7. The video has been lighting up the Internet since, and of course many people are offering extraterrestrial explanations.

As is de rigueur these days, the UFO clip was uploaded to YouTube, where it has been viewed millions of times. Some comments say it's clearly an extraterrestrial spacecraft; others insist it's a fake. Still others say it's neither but instead is a real object - such as a plastic bag in the wind, a parachute seen from above, or a drop of water on the window - that simply looks strange from that angle.

Aside from the anonymity of the cameraman, the video raises some red flags about its authenticity. For one thing, the video is not complete; it has been purposely edited to leave some information out. We know this because it begins in progress, with the UFO already well in frame, in the lower right-hand corner. The video camera didn't suddenly turn on to capture that scene; there must be at least some video that was recorded the first few seconds of the camera being turned on or the cameraman pointing the camera out the window. This type of selective editing .