I tryyyy so hard to use preventative techniques when out and about so I don't have to deal with it. But the other day I had to put Han in time out in the playground. Just sat her against a fence away from all the stuff and she screamed the whole time
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I do cut her a bit more slack when we are out as usually her bad behaviour is the result of being tired or hungry so usually my fault
But yeah, tantrums I just leave her to it until I can gently persuade her to come with me and give her a quiet talking to about "appropriate behaviour"