There you are, just about to tuck into one of your favourite meals – grilled cheese, preferably Cheshire, and hot plum tomatoes rolled in Staffordshire oatcakes – when you suddenly remember that none of it exists. It takes the edge off the experience, you know? It's no joke.
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But this is. While thinking about what Descartes said about existence, a thought occurred to me. If ever I drown, my last thought before leaving this life will probably be ‘I sink, therefore I’m not.’