A man was sitting at home one evening when the doorbell rang. When he answered the door, a 6 foot tall cockroach is standing there. The cockroach immediately punched him between the eyes and scampered off.

The next evening, the man is sitting at home when the doorbell rang. When he answered the door, the cockroach is there again. This time, it punched him, kicked him and karate chopped him before running away.

The third evening, the man is sitting at home when the doorbell rang. When he answered the door, the cockroach is there yet again. It leaped at him and stabbed him several times before making off. The gravely injured man managed to crawl to the telephone and summon an ambulance. He was rushed to intensive care and they saved his life.

The next morning, the doctor was making his rounds. He asked our hero what happened. 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 is a nasty bug going around."