A friend of mine, cigarette in hand, mysteriously showed me his index finger. "Look, everyone's index finger represents the greed of a person, because the desire for food is the most basic and primitive desire of human beings. Do you know why it's called the 'index' finger? Because once our ancestors saw something delicious, their index fingers would twitch - isn't there a Chinese idiom, 'shi zhi da dong' (one's index finger moves a lot)? I'll now tell you a story about the index finger." With that, he stubbed out his cigarette and began to recount this story.