For those of you who don't know what Mu means it is japanese for "nothingness" or "no meaning". I was reading an interview with Tsugumi Ohba (creator of the manga "Death Note") and he believed that when you die you go to Mu, in which it makes sense in an Atheistic point of view:everyone dies the same way, no right or wrong, you are like before you were born.
He had an interesting concept that actually disappearing to Mu is scarier than going to heaven or hell, because the result is so definite, so equal, so black. I must say, I wholeheartily agree with this concept, I mean even if you knew you were getting tortured for eternity you'd have conscienceness to see it all, when the light switches and you are totally just turned off, THAT'S IT. No going away party, no torture, NOTHING, all of your memories erased good and bad, all of the things you did to make yourself a good person. Its pretty scary concept, you live your whole life used to it and for your conscienceness to stop, its sometimes mindboggling!