When I know today's topic, I thought pretty hard to think about a joke that I heard before. Then my mom asked me a question that 'Why I need to pay for this guy? I just want to give him a like.' 'Maybe you hit the wrong button.' I said.  'No, several days ago, this happened before, and I don't know why.' She said. 'Maybe this guy just want your money. You should be careful when you use WeChat. Just leave me alone, I'm doing my homework.' When the third time she asked me about that, I took it seriously. And this time, I know why she has confusion. As she hit the reward button instead of like. She thought reward is the same as like.  The first time she told me that, I laughed at her. I thought maybe her eyeglasses should be changed. But it turns out that I was wrong. I guess I should be more patient to her when it comes to gadgets. For me it is really easy to use applications, but it's harder for some middle aged people to use that than I thought. Sometimes I consider their mistakes as jokes, but they may be embarrassed if we laugh at them.