My favorite peformance's of Wanna Be Startin Somethin' are from the 1988 European leg of the Bad Tour (live loved the synth driven sound of Wanna Be Startin Somethin' from this part of the Bad Tour).
I always thought Michael should have dropped Wanna Be Startin Somethin' from the set list of the Dangerous and HIStory tours, because Wanna Be Startin Somethin' is a song that is made for opening concerts and not as a second song on a set list.
I love Michael's performance of Wanna Be Startin Somethin' on the This Is It movie. Great vocals (even though he's not singing at full range to save his voice), and I love the fact that Michael changed the routine of Wanna Be Startin Somethin that was more a less the same from the Victory Tour to the HIStory Tour (though the "HOOoo" and "Come On Baby, Come On Baby, Hee Hee, Aoaw, Wanna Party" part at the end of Wanna Be Startin Somethin' was different on the 1988-89 leg of the Bad Tour to all of the other tours), with Michael doing the same opening pose and dance routine with his dancers. I like the fact that Michael was performing the first part of Wanna Be Startin Somethin' on stage alone, and that the dancers didn't appear on stage until after the guitar segment. I also loved Michael's new arm movements around the guitarist on the performance of Wanna Be Startin Somethin', which was also something new Michael had never done before when performing the song.