21 Fun Facts That Will Undoubtedly Give You Cold Shivers Down Your Spine

Some of the facts on this list are simply said frightening and weird. Did you know, for example, that an octopus has blue blood? Or that the anus of a snail is on his head. Unbelievable, huh? Scroll down to read some more fun facts that will undoubtedly give you cold shivers down your spine.