It's been 29 years since the night Ozzy Osbourne bit the head off a bat onstage, and he's still wondering why people still ask him about it.

"One of the things that amazes me is, even now people go, 'So Ozzy, did you really bite the head off a bat?'" Osbourne said a press conference at the Tribeca Film Festival on Monday. "If you didn't know, then you must be living in a cave."

To promote the new documentary, 'God Bless Ozzy Osbourne,' the former Black Sabbath frontman, his son Jack Osbourne, who co-produced the film, and directors Mike Fleiss and Mike Pischtelli gathered at the School of Visual Arts Theatre to speak with press about the film. While Osbourne has been a mainstay in the press for the last four decades, 'God Bless Ozzy Osbourne' gives viewers a look at his life outside of the limelight.

Although the Osbourne family did welcome cameras to film every moment of their lives on 'The Osbournes' TV show, the documentary reveals moments that wouldn't be on reality TV. "Everyone has seen so much of him," Pischtelli said. "But no one has seen John with his moments at home and on the road when he forgot the cameras were there and decided to break down. [The film] isn't revealing any shocking news, but it's also revealing what an awesome guy he is. It's more than just the rockstar. It's him and everything he's done and gone through."

With Osbourne discussing so many delicate issues including his former drug use and past partying lifestyle, one wonders how one can be so candid and open. However, Osbourne believes that everyone has their issues and if he wasn't open about it, people would drag it out anyway. "We've all got skeletons somewhere," he said. "We've all gone through the thing where you go, 'S---, did I do that?' But that's what life is all about. Like when I s--- my pants, people aren't really interested in you when they walk behind you and you've had too much to drink and you defecate in your pants. People don't want to know that stuff. So there's nothing really worth hiding."

Osbourne also didn't shy away from talking about past drug use and how he kicked the habit. "What makes me flip out [is] when people go, 'He went to rehab, and it didn't work,'" he explained. "It's not the rehab that didn't work, [but] the information they gave you about yourself... That's what the difference is. I just got fed up with me being that f---ed up all the time. It wasn't fun anymore."

'God Bless Ozzy Osbourne' also looks at the singer's marriage with Sharon, his second wife. Although Osbourne and Sharon have been married for a long time, he admits that it wasn't always easy. "My first marriage didn't work, and my second marriage did. There's no hidden secret. It's just the way it turned out, and I'm glad."

'God Bless Ozzy Osbourne' is currently screening at the Tribeca Film Festival with showings on April 28 and April 30.

Watch the video for 'Crazy Train'

if(typeof AOLVP_cfg==='undefined')AOLVP_cfg=[];AOLVP_cfg.push({id:'AOLVP_91198942001','codever':0.1,'autoload':false,'autoplay':false,'displaymnads':true,'playerid':'89761511001','videoid':'91198942001','width':456,'height':357,'playertype':'inline','stillurl':'dynamic','videolink':'#','videotitle':'dynamic','videodesc':''});