One quiet evening at home, a man's doorbell rang. He opened the door to find a six-foot-tall cockroach standing outside. The cockroach quickly punched him between the eyes and scuttled away.

The next evening the doorbell rang again. The man opened the door to find the cockroach was back. This time the big bug punched him, kicked him, and karate-chopped him before racing away.

On the third evening, the cockroach was back yet again. When the man opened the door, it jumped at him and stabbed him several times before running off.

Although gravely injured, he managed to crawl to the telephone and call for an ambulance. He was rushed to intensive care, and his life was saved. The doctor came to visit him during morning rounds the following day and asked him what had happened. The man explained about the cockroach's attacks and the stabbing that almost killed him.

After a moment's thought, the doctor said, "Yes, I hear there's a nasty bug going around.