Many things are unlikely about the MJ-Macca pairing: that "The Girl Is Mine" was actually the lead single off "Thriller," that Jackson would later buy the rights to Beatles songs behind McCartney's back, but most of all, that the two mega-stars would ever fight over a woman. But after having a ball recording McCartney's "Say Say Say" together in 1981, Jackson and his Beatle friend gave it another go with the cheesy, soft-rock duet. "The Girl Is Mine" peaked at No. 2 on the Hot 100, and stayed there for three weeks -- probably because we were all surprised to see the two superstars singing together.