See Marilyn Manson's First 'Letterman' Interview Take Shocking Turn With Bestiality Revelation

"I like to provoke people so they think — I think that's a healthy part of entertainment that you don't get too much from the Spice Girls," Marilyn Manson said during his first appearance on the Late Show with David Letterman in 1988. "Unless you're just trying to think about Ginger Spice's waistline." The shock rocker was there in support of his then-recently-published memoir The Long Hard Road out of Hell, and prepping for the release of Mechanical Animals later that year, and he gave Letterman and his audience much more to think about than a pop star's physique. In particular, Manson flustered the host and elicited an audible gasp of disbelief and horror from the audience when he reveals — on national TV — that his grandfather was a cross-dressing truck driver who collected bestiality pornography. Watch the full clip above, which includes other eyebrow-raising revelations about Manson's family life, background and philosophy.