Petrol, in case I have to take my wife's car to collect my normies from some disaster. I refuse to pay Sadiq Khan's tax to use my diesel. If I had any way to do it, I might buy a little XRP when it drops below say 10p in a crisis. I'd imagine it is the best bet to recover value in a new financial world, and possibly less likely to be stolen that physical silver or gold, neither being any real use to go shopping in the temporary dystopia.