A man is sitting at home one evening when the doorbell rings.
When he answers the door, a 6 foot tall cockroach is standing
there. The cockroach immediately punches him between the
eyes and scampers off.
The next evening, the man is sitting at home when the doorbell
rings. When he answers the door, the cockroach is there again.
This time, it punches the man, kicks him and karate chops him
before running away.
The third evening, the man is sitting at home when the doorbell
rings. When he answers the door, the cockroach is there yet
again. It leaps at the man and stabs him several times before
making off. The gravely injured man manages to crawl to the
telephone and summon an ambulance. He is rushed to
intensive care, and they save his life.
The next morning, the doctor is doing his rounds. He asks our
hero what happened, so the man explains about the 6 foot
cockroach's attacks, culminating in the near fatal stabbing.
The doctor thinks for a moment and says,
"Yes, there is a nasty bug going around."