Well not sure what 'the' Big Bang is. Some modern theories suggest there maybe an infinite number of Big Bangs occurring deep into the past and future. I guess this is 'our' Big Bang which according to some other theories, may itself contain a vast number of other Big Bangs.
Of course those other Big Bangs would be somebody else's rather than ours. (You could drive yourself to the drinks cupboard just thinking about this stuff.)
