Kanye West’s return to Twitter doubles as yet another of the artist’s ambitious projects: his tweets are becoming a philosophy book, written in real-time. This is just Kanye’s newest out-of-the-box idea—and, more importantly, it’s one of the likely thousands of ideas that he has that have actually come to fruition. An artist as prolific and creative as Kanye must leave quite a few projects by the wayside. Take, for example, a documentary of his that never saw the light of day.

The trailer for the doc, titled What Doesn’t Kill Me, was directed by Tobias Spellman and can be seen above. Based on the trailer, the doc followed Kanye and his team as they prepared for the Glow in the Dark Tour, one of Kanye’s largest world tours that went from April to December 2008. The tour also featured performances by Rihanna, Lupe Fiasco, and N*E*R*D, among other acts throughout the trek.

Kanye has come a long way since 2008, but many fans would echo Perez’s sentiment that this doc should still come out. It’s unclear why it wasn’t released, and there are few mentions of the doc anywhere, suggesting it was done in secret and stayed that way for some reason.

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In any case, we know from the Great Kim Kardashian vs. Taylor Swift Feud of Summer 2016 that Kanye always has a film crew when he’s in the studio. Kim told GQ that Kanye “commissions videographers to film everything when he's recording an album, for posterity (and possibly, one day, a documentary).”

There is probably a lot of footage of Kanye in the studio that we might never see. With that in mind, this trailer becomes even more precious.