Every night, Frank would go down to the grocery store, buy a six-pack, bring it home and drink it while he watched TV. One night, as he finished his last beer, the doorbell rang. He stumbled to the door and found a six-foot cockroach standing there. The cockroach grabbed him by the collar and threw him across the room, then left.
The next night, after Frank finished his fourth beer, the doorbell rang. He walked slowly to the door and found the same six-foot cockroach standing there. The huge insect punched him in the stomach, then left.
The next night, after Frank finished his first beer, the doorbell rang again. Frank was apprehensive, but opened the door anyway. As he expected, there was the same six-foot cockroach standing there. This time, Frank was kneed in the groin and hit behind the ear before the cockroach left.
The fourth night, Frank didn’t drink at all. The doorbell rang. Against his better judgment, Frank opened the door once again. There stood the cockroach. This time, it beat the ever-loving snot out of Frank and left him in a heap on the living room floor.
The following day, Frank went to see his doctor. He explained the events of the preceding four nights. “This is driving me crazy,” said Frank. “Is there some way you can help me?”
“I wish I could, but there’s not much I can do,” answered the doctor. “There’s just a nasty bug going around.”