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On a slightly more weird note I once read of someone working in a lab many years ago where one of the jobs was to analyse urine samples from people working in some bit of the nuclear industry. They were looking for contamination by uranium and plutonium and the technique was quite simple. Dry down a sample of the urine in a dish, heat it to burn off the organics etc and check the ash with a geiger counter.One day they made a strange observation. The urine sample from one person turned greed as it was dried down and then it exploded. The poor bloke doing the analysis repeated the experiment with the same result- this person really had got explosive urine. It turned out that he had been taking a cough medication containing perchlorate and this was being excreted via the kidneys.I just can't help wondering about the lab technician having to go to his boss and explain what caused the bang.