[youtube]http://www.youtube.com/watch?v=2dA-AL90_RE[/youtube]The only Tony that Metal Insider watches is Tony Iommi, but we heard about this and had to post it. Poison joined the cast of  ’80s hair metal-centric musical “Rock of Ages” for a performance of “Nothin’ But a Good Time” at the Tony Awards last night (aka the Broadway version of the Grammys). Everything was going fine until the end of the song, when in a Spinal Tap-esque moment, Michaels got knocked on his ass by a stage set lowering from the ceiling. Our words don’t do it justice, so take a look for yourself.