Ah ha, this is an idea I have pondered with myself for quite sometime. Its a hard idea to explain.

That makes me think about Death quite a bit... it reminds me of something I saw in House. A guy had his brain zapped because of a condition (which it later turned out he didn't have). All of his life, disappeared. All memories, gone. It was as if his life started at that moment, though he knew it didn't. It all happened, but he can't even imagine it happening. It happened, but its like it didn't. If when we die our brain's shut down completely, we would thus lose all memories. Thus, based on that, why can we "remember" this 'Now?'