And (from my recollection) the mooning was because he was constantly being asked about the acupuncture procedures he'd been having on his posterior....he wasn't (necessarily) being crass but rather allowing the reporter in the helicopter to get the complete story...

Don't follow the links if you may be adverse to reading Jim on this topic in his own words or see him....
http://sports.espn.go.com/nfl/news/story?id=2748014
http://michaelweinreb.com/2010/07/15/photos-2/