When I was a University chemistry student long long ago, we had one guy disappear off the course and then turn up again a year later, but in the year below. He was also now missing the ends of a couple of fingers and had some big facial scars. It turned out he had been trying to make a small explosion for a prank during his summer break, and ended up in hospital.
Only ones where we put dry ice into (small plastic) test tubes and waited for it to warm up! They were jsut a little bit noisy, not dangerous unless you had them near your face.
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