TIL the guy who created the Ultima videogame series claims to own a chunk of the Moon.
In 1993 Richard Garriott bought two space exploration craft still on the Moon from an auction at Sotheby's, and he claims that legally gives him ownership over the section of lunar terrain they surveyed.
As @ZachWeinersmith 's book A City on Mars succinctly puts it "No space lawyer we talked to shared this view."