A man was sitting at home one evening, when the doorbell rang.
 
 When he answered the door, a 6 foot tall cockroach was standing
 there. The cockroach immediately punched him between the eyes and
 scampered off.
 
 The next evening, the man was sitting at home when the doorbell
 rang again. When he answered the door, the cockroach was there
 again. This time, it punched him, kicked him and karate chopped
 him before running away.
 
 The third evening, the man was sitting at home when the doorbell
 rang. When he answered the door, the cockroach was there yet
 again. It leapt at him and stabbed him several times before
 running off. The gravely injured man managed to crawl to the
 telephone and summoned an ambulance.
 
 He was rushed to intensive care, where they saved his life.
 
 The next morning, the doctor was doing his rounds. He asked the
 man what happened, so the man explained about the 6 foot
 cockroach's attacks, culminating in the near fatal stabbing. 
  
 The doctor thought for a moment and said, "Yes, there's a nasty
 bug going around."