The photo shows what a Carbon Dioxide (CO2) extinguisher looks like. If you have one, try picking it up and pretend you are fighting a fire with it. Did you hold the black tube (or horn) to steady it whilst in use? Then by now your hand would be frozen onto the horn! As the liquid in the extinguisher escapes and turns into gas, it freezes and rapidly cools the horn. Although it is possible to get anti-frost horns, they are hard to identify so...
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