Who is Joan Rivers?

My son Vince just asked me 'Who is Joan Rivers?' 'Well hijo, have a look at wiki!'Most of her brilliant stuff is probably too obscene for this time of the morning and she can be so sharp I would be worried by people getting paper cuts on this blog from some of her videos.This is pretty funny and disturbing though.And I guess you have picked up on her being banned by Fox for saying of their poster