A few times I have had to lie down on the floor and have a tantrum myself..whilst children have had tantrums - they didn't know what to do and stopped sooner rather than later....a bit extreme I know....one of the tantrums in particular was by a young lad and prior to his mother calling me he had threatened her, had started throwing stools and chairs around and I was called by Mum becuase she was actually scared...I think young lad was either 6 or 8...he was still tantrumming when I got to house, so I laid on floor whee he was by this time screaming his head off and shouting...and did exactly the same....he went quiet within 2 mins max.....then we went up to his bunk bed and had a talk...
Done it a few times, and in public as well but the children are friends children...not my own..I haven't got any....that is my only experience of finding a way of stopping a tantrum without bribery or promises on my behalf......well,,,I do make promises when they stop that we can go and talk about it....etc
I know another lady had a brilliant way of handling tantrums on this website but can't find the posting.....I expect they will be along later....