Moon Unit, on two occasions that come to mind; both when she was about 6.
At the grocery store. I had, for some reason, bowed down to the kids’ request to use one of those goshawful truck-carts. Moon Unit rode in it all the way through the store. Dweezil (9), wanted to sit in it for a few minutes while we checked out. Moon Unit vacated it, Dweezil sat in it.
Then Moon Unit decided she wanted to get back in. I decided that no, it was Dweezil’s turn, he was happy in there, and she’d had 40 minutes in the damn thing and we were going to be done in 10.
Moon Unit’s shrieks escalated to the point where I’m quite certain the WHOLE STORE could hear her. We were stuck in the checkout line at this point - it was just before Christmas, the store was mobbed, and the roast I was buying (among other things) would double in price the next day so I had to purchase it. Typo Knig wasn’t with me so there was noone to drag the kids bodily out of the store. I was mortified.
And even more so, 2 days later, shopping at Toys R Us… when another shopper there recognized my daughter by name. She was the poor soul in front of us in line at the grocery.
I know a “better” response would have been to pull the cart out of line, take both the kids, and leave the store without making my purchases but then the store staff would have had to deal with putting everything back.
And another time, at Brownies that same year. Moon Unit got upset over being paired with someone for some activity. I told her she had to settle down or we’d leave. She did not. I said we were leaving. She resisted. I had to bodily drag her out of the building - fighting the whole way. She sank her teeth into my thumb so badly it ached for a week (I was afraid she’d broken the bone). Another parent had to help me - that parent has an autistic child so is more familiar with out-of-control public situations than many so I was glad it was her helping me. In desperation, I tried spanking Moon Unit but - as expected with a kid in that state - she didn’t even notice me swatting her behind so that was unhelpful. I had to physically force her into the car - she tried to climb onto the roof.
I got her home, by which time she had started to calm down. We canceled her birthday party (scheduled for 2 days later) but could not reach all the attendees because some had not RSVP’ed so they showed up anyway, that was pretty mortifying. I still get sick to my stomach thinking about that whole scenario.
The one funny thing about it: A few months later, she came to me with a very serious, sad expression on her face and said, with GREAT pathos, “It really hurt my feelings when you cancelled my birthday party”. A Good Mommy would surely respond to that with sympathy and sorry and hugs, right? She surely had every right to expect that, right? HAH!! I said “Good!”. In utter shock, she said “You’re glad you hurt my feelings?”. I said “I’m glad you were upset. That was a punishment for your really horrible behavior. If you weren’t upset, it didn’t teach you anything. Misbehaving causes you to lose good things”.
Interestingly, the responses to that tale (tantrum, canceled party) are of two types: “You go, girl!” from anyone who has, or works with, children. And horrified “YOU CANCELED HER PARTY???” from people who do not.