Depending on who, what where and when the tantrum happens. My best friend had was getting into abit of a tantrum last summer because he couldnt find something, when I only told him I moved it about 2 minutes earlier, so while he was throwing this paddy, I walked into the house, he was still shouting thinking I could hear him, so I got a bucket of cold water and threw it over him! He soon shut up and stopped and forgot what he was tantruming about! For a child though I would just copy them, my friends son did this and he ended up laughing seeing me stomping my feet and throwing my arms etc.