Luixy Toledo (real name Luis Valverde Resino) is a Spanish composer, musician, and actor, who seems to be pretty famous in his home country, mainly for being an outrageous nutcase. He talks about his sexual experiences in his former life on Mars, claims that our solar system has 12 planets, and has other interesting theories. His songs deal with issues like AIDS (MP3), Lady Di, and life on mars. Since he and Michael Jackson were both born on August 25, Luixy sent Jacko several of his songs as birthday presents in 1969 and 1974, among them one called Exorcismo. When Luixy heard Thriller in the 80s, he realized that he got screwed. However, a court ruled that the similarity was purely coincidental. Judge for yourself: Luixy Toledo - Exorcismo (MP3)
According to this source, Luixy has a second version of the story: He wrote Exorcismo in one of his previous lives in medieval Italy, and Jacko's former self was also around at the time and snatched it from him. I have to admit, I like this one better. But why in Italy and not on Mars?