According to this article on Celebrity Babylon, Will.I.Am actually hung up on Michael Jackson, thinking it was a prank call. Check this out:
Black Eye Peas singer Will.I.Am hung up on Michael Jackson! Will, real name William Adams didn’t believe that he was being rang up by the Thriller singer, and told him to beat it! “(Jackson) called me out of the blue. I’m like: ‘How did you get my number?’ He was like, ‘What’s up? It’s Michael.’ And I was like: ‘Stop playing around dude. Who is this?’ He’s like: ‘It’s Michael, seriously. No one ever believes me.’ I’m like: ‘Stop playing. I’m hanging up the phone.’ Click!” Adams feels anyone else in his situation would have done the same thing, “If someone rings you up and says it’s Michael, you ain’t gonna believe them because it’s easy to imitate his voice.”
black-eyed peas, black eyed peas, black-eyed-peas, hip hop, hiphop, michael jackson

I will surely miss Michael Jackson, he is really worthy of the name King of Pop and he is certainly one of the greatest musicians of all time.