UFO over South Korea? Why the video is probably fake. (+video) (2)

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.