Late one night, a man heard a knock at his door. When he answered it, he found a six-foot cockroach on his doorstep. The roach grabbed the man, threw him against the wall and left. The next night, the cockroach came back. This time, it punched the man in the stomach. The cockroach came back a third night. This time, it roughed the man up so badly that he had to go to the hospital. He told the doctor what had happened and asked what he could do. "Nothing," said the doctor. "There's just a nasty bug going around."