@chai2,
We have a friend who is bi-polar. When he is off his meds he does stuff like this. We know him as the normal, nice guy, so when he got arrested for acting like a total jackass we were totally shocked. He was amazingly paranoid and ranted like a wild-man - much like Mel Gibson in this audio. But once they got him into the mental hospital and got him on his meds again, he was back to his normal, sweet self. The sad thing is - he hates taking his medicine, and has to be committed to get him back on.
It is the only explanation that makes sense to me.
Or maybe he has just gone off the deep end like so many Hollywood folks seem to. They lose touch with reality it seems.
Either way - it is just so sad - for everyone he is involved with as for him.