There is a traditional habit in our family, that is, we eat ice cream for dessert after dinner every day. Because there are many flavors of ice cream, my family only votes to decide which flavor to eat after dinner every day. After everyone decides, I will drive to buy it. But since I bought a new Pontiac recently, there have been problems on my way to buy ice cream. Do you know that?/You know what? Do you know that?/You know what? Whenever I buy vanilla ice cream, my car won't start when I get out of the store. But if I buy other flavors, the car will start smoothly. I want you to know that I am serious about this matter, although this question sounds stupid. Why does this Pontiac stall when I buy vanilla ice cream, and it is a living dragon whenever I buy other flavors of ice cream? Why? Why? In fact, the general manager of Pontiac was very suspicious of this letter, but he sent an engineer to check it. When the engineer went to this guy, he was surprised to find that the letter was written by a successful, optimistic and highly educated person. The engineer arranged to meet the man after dinner, so they jumped into the car and drove to the ice cream shop. That night, the vote was vanilla. When I bought vanilla ice cream and got back to the car, the car stalled again. The engineer came for another three nights as promised. The first night, chocolate ice cream, the car is fine. The next night, strawberry ice cream, the car is fine. On the third night, vanilla ice cream, the car "stalled".