It’s hard to believe that August will mark the 25th anniversary of Michael Jackson’s Bad album. Director Spike Lee is working on a documentary to celebrate the pop culture moment, according to AP.

“We have footage in this documentary that no one’s ever seen, stuff that Michael shot himself, behind-the-scenes stuff,” Lee said. “We had complete access to the vaults of Michael Jackson.” 

He called it a “treasure chest of findings,” revealed the director. “He wrote 60 demos for the Bad record. Only 11 made it. So we got to hear a lot of that stuff, too, so it was just a great experience.”

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A few of the timeless songs that did make the album include “The Way You Make Me Feel,” “Smooth Criminal,” “Dirty Diana” and “Man in the Mirror.” 

Lee, who called Jackson a friend, said the documentary will also show a personal side of the King of Pop. “He had a great sense of humor, and he was funny — so you’ll see a lot of that stuff,” he said.

Although a release date for the film has yet to be set, a re-release of the Bad album will hit stores on September 18. It will include additional songs, a DVD and other bonus materials.