【正确答案】
Last Sunday, I had a very amazing experience.
On that morning around nine o'clock, I was on my way to my company in a bus. There were not many people on the bus. After a bus stop I felt a little strangely crowded in- side the bus. A moment later I happened to see that a young man stealthily managed to stick himself tightly to a young lady. I first felt strange but didn't pay any attention to it, Suddenly, there were two men rushed passing me so fast that I was scared and then I saw the sticky young man was lying on the floor of the bus. No one realized what was happening at that moment. But very quickly, all of us knew that the young man was a thief and the other two, of course, policemen.
Such an experience made me realize that: be careful' a thief may be beside you; and also: don't worry, police will help you.