It's not what's on the outside you should be worried about. It's what may or may not be secretly living inside you that should keep you up at night. The creepy crawlers on this list of terrifying things found living inside humans will give you nightmares for weeks. Some entered these humans through food, while others dropped their eggs right on an unsuspecting host's head. However they got there, they will all make your skin crawl.
Here is a list of the creepiest non-human invaders that could end up living inside you, sometimes without your knowledge. This list of horrifying things found living inside people includes insects, other bugs, worms, sperm, fis-- wait, what? Sperm?
Yes. Sperm. Squid sperm to be specific. Click through the list below to find out what kinds of creepy creatures have been found living inside humans, and could one day end up inside you. Collection Photo: NBC