Rabies

The tough businessman was feeling very ill and went to the doctor. The medical practitioner¹ examined him and backed away, saying:

"I'm sorry to tell you this, but you have an advanced case of highly infectious rabies. You must have had it for some time. It will almost certainly be fatal."

"Could you give me a pen and paper?" said the businessman.

"Do you want to write your will?"

"No, I want to make a list of all the people I want to bite."