Have you ever created a monster by accident?

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In chemestry class a couple months ago, we were doing a lab that had to do with reactivity series of certain acids and metals. There was one called 'element X', which I knew all along was calcium. Having no idea what calcium does at the time, we washed out our testtubes into the trough. Sticking to the black countertop was a steaming, foaming beast. Treaver was scared, so he tried to neutralize the acid with soap. It only became more infuriated.