Did you know that Mario first appeared in a Japanese Donkey Kong arcade game in 1981? Though some say he was originally called "Jumpman," he was actually unnamed in the original Japanese game. Mario's creator, Shigeru Miyamoto didn't expect one of his modest side characters to become so popular, but when the little plumber started gaining a fanbase, Miyamoto decided to call him "Mr. Video." Mario was originally intended to be a sort of recurring background character who would make cameo appeara…