I just read in a wiki-article about one of the 2 parts that this guy ment made up existentialism: Hell is other people and Pain is conciousness.
Here’s an excerpt I think we all should have a look at:
This paradox, that the only thing that can save you from the pain of conciousness is another being, but that being will rebel at being used solely in that way, is what the existentialists mean when they say ‘Hell is other people.’ I can not argue against this statement.. Shit.
Here’s the reverted article Wikipedia: Existentialism and here is the old one: Wikipedia: Existentialism – Talk. Worth a look.