I have a very superstitious friend called Mack. He thinks that if he breaks a mirror, he will have seven years' bad luck. As a result, Mack doesn't have any mirrors in his house. But not all superstitions are about bad luck. For instance, Mack also believes that if he drops his chopsticks, someone will invite him to dinner. So, Mack is always dropping his chopsticks and waiting for an invitation .
