Partially-empty cylinders are actually more dangerous than full ones because they cannot absorb as much heat prior to venting or exploding. The fun went south when one cylinder violently vented toward an unfortunate reveler. I cannot reveal the patient's name due to HIPPA laws, but he was transported to a burn unit for attention to his 'party favors.' I understand that the gene pool is still at risk from these rocket scientists, as the close call was not fatal.
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Reference: Personal Account by Chip Drysdale