Evidence of aliens is always a little shaky, but that doesn't stop believers from spinning some pretty wild theories. According to one theory, tablets discovered in Mesopotamia in the 1800s indicate ancient Mesopotamians were actually human-alien hybrids. What's even weirder? Advocates believe Al-Qaeda deliberately destroyed proof of aliens.
Where's the proof that ancient Mesopotamians were aliens? Some of it was looted from the National Museum in Iraq in 2003, possibly in an effort to cover up the area's extraterrestrial origin. However, Mesopotamian artifacts, mummies, and myths have also been cited as evidence the region was founded by aliens searching for gold. Whether you believe the story or not, it's a pretty wild tale that can be amusing to read up on.