The human body is an absolutely unbelievable creation. Whether you believe it was sculpted by a deity a billion years of biological trial and error, our very existence should never be taken for granted. But nothing's perfect. Nature is barbaric, and as much as we like to think we're above the natural world, we're not. The human body is creepy and can have creepy things done to it. Here are 24 of the scariest. 

For what it's worth, humans very rarely just drop dead without cause. The heart rarely fails to keep beating, and the brain never forgets to tell you to breathe. But things like aneurysms, dormant cancers, and surprise infections can pop up and kill you in days. An auto-immune attack can do the job in 15 minutes. Life is fleeting and can be filled with immeasurable pain. Don't take your comfort for granted.