(Cover) - EN Showbiz - Director Spike Lee was surprised to learn how "self-motivated" the late Michael Jackson was.

Spike has put together a commemorative documentary on the King of Pop entitled Bad 25 in celebration of the 25th anniversary of Michael's 1987 hit record Bad.

The filmmaker was impressed with Michael's dedication to his music.

"I learned that, number one, he was very self-motivated," Spike told MTV News. "Even though it was an impossible task, Michael wanted Bad to outsell Thriller. And everywhere he'd go, he'd put up signs, write on mirrors in bathrooms: '100 million.'

"He always wanted to surpass what he had done previously and 100 million albums sold. He was determined to do that."

Bad went on to sell around 30 million copies internationally.

The record is also the fifth highest selling album in history.

Epic Records will release Bad 25, which included the original album, unreleased demo songs, Spike's documentary, concert footage and remixes, on September 18. (C) Cover Media