Found this gem on Reddit. This is what happens when you are top heavy. I would have loved to be underneath her and allowed to put my hands all over that body. Actually this was the best comment on Reddit.
She panicked and forgot basic crowd-surfing technique.
You can see the moment when she realizes she’s crowd surfing in a dress and she tucks up her legs to protect her modesty. Instantly all her weight is now resting on half as many people as it should be; without proper weight distribution she plunges through the crowd.
Lesson learned: keep your body spread out to maximize support, and go with the flow. Expect gropings because they’re unavoidable.