What scams have you all encountered? Have you been cheated?

In p>7, my sister from the factory next door agreed to buy cut cakes for 2 kilos, and then refused to let her go. It happened that my colleague and I came out to buy clothes and saw my sister and Alibaba pulling her. My sister was about to cry. I watched for a while, knew the reason, and wanted to help. My colleague refused to let me, saying that we were also helpless little girls. Okay ~ _ ~ Mainly because the stall owner was scattered behind me. At first glance, I didn't dare to go up, but I felt uneasy about running away like this. I didn't go away, and I kept trying to find a way. I just saw a group of boys passing by my sister and asked her what she was doing. My sister estimated that she was embarrassed to say it, so she responded by saying that she wanted to buy cut cakes, and the man left. As soon as I thought it was an opportunity, I ran after them and didn't know how to speak. After all, she was a girl and shy. After a while, I got up the courage to say, hey, do you know that girl? They said she was a colleague. I said she was cheated. The stall owner wouldn't let me go. You went back to save her, and then told them what I knew. They hesitated and went back, and then my colleagues and I followed. When I saw that they didn't talk, I said it first. I said, hey, if you don't come back for a long time, we will come out to find you. Then the stall owner came to drag her, and I said, what are you doing? We didn't want it. Then the men spoke, and we didn't want it. We went back. Then I dragged the girl in front, and 6.7 of them walked behind, and we left. The stall owner swore and stopped pulling. I let go of the girl after crossing a road. Because it was different from the girl, my colleagues and I stopped to return. As a result, they just talked and left without noticing me. I'm afraid. Although I'm very scared inside, I don't regret it every time I think about it. My age is 17.