Top 10 Explanations for UFOs

Ball Lightning is a sphere of static electricity that has the ability to glow intensely for several minutes - Irina2932

One aircraft by the military has been mistaken many a times to be a UFO because of the strange shape. Really, it's just for stealth. The b2 stealth plane (search it on Google Images) looks like a UFO from the bottom.

Just look at these clouds - its shape looks like UFO - Irina2932

No joke. Some people were confused and called it UFO - Irina2932

Sometimes aliens came to visit us. Watching you!

It's there watching when you think of it

I see aliens in this list..

Venus makes an especially bright appearance in the night sky, so this explanation is not as far-fetched as it seems. - Irina2932

Being an ameture (sp? ) astronomer, I have experienced this firsthand. Many people mistake Venus for an alien spacecraft, because it's the brightest "star" in the sky. - RockFashionista