Daniel: Hi, Simon. How are you these days? Simon: Not bad. But I just feel a little sad. Daniel: What's wrong? Simon: You see, I bought some goldfish last week. But now they all die. Daniel: I'm afraid you forgot to change water for them. Simon: No.  I just gave them a lot to eat. I think they like eating. Daniel: Oh,I see. It's the food that killed your goldfish. You know goldfish can only remember things for 3 seconds. Simon: So what? Daniel: So they always forget they have already eaten food. They just keep eating if you feed them. Simon: You mean my goldfish die of eating too much? Daniel: That's right. Simon: Oh,my poor goldfish. Daniel: Don't be sad. Why not have a cat or a dog as your pet? Simon: Oh, no. I don't like them. Cats and dogs always make much noise and they will make my room dirty. Besides that I should take good care of them. Daniel: Well,why don't you try an e-pet?  It's modern and cute. And it's easy to look after because they don't need food and water. The most important thing is that you can control it freely. Simon: That's good! I want to have an e-pet. Daniel: That will cost you a lot of money. Simon: Oh, my God! I think I will just have it in my dream. Why did the goldfish die?
Because they ate too much. Because they were too hungry. Because Simon didn't like them. Because Simon didn't change water.