A teaser from Michael Jasckson’s “This Is It” movie. The documentary will chronicle the King of Pop’s rehearsals for what was to be his big come back concert series at London’s O2 Arena.

The latest bittersweet clip features a very thin, yet magical MJ rehearsing “Human Nature” from his landmark album, Thriller. Though he looks very frail, he never skips a beat practicing his much-imitated dance moves, and his voice was as strong as ever.