Aliens coming to Earth and destroying mankind is the setup for probably hundreds of movies. So much so, you'd probably think it was an actual threat we'd have to worry about. And while it's highly unlikely that aliens are sending their ships towards Earth right now to wipe us all out, that doesn't mean finding extraterrestrial life would be a good thing either.

The people behind the "In a Nutshell" YouTube channel recently posted a video about how discovering alien life would probably be the end of humanity. But it's not because of spaceships and lasers, but rather due to our very own DNA. Take a look at the video above.

So, maybe we should cancel those missions to Mars.