This is not a big field of research. Perhaps more original work needs to be done, although I am sure we have all re-purposed jokes about other vocations or professions when pushed.
However here you will find, just in time for the silly season, 20 jokes about life insurance. I shall reproduce one sample and you can view the rest at your leisure by clicking on the link below.
This one artfully explains non-disclosure.
The applicant for life insurance was finding it difficult to fill out the application. The salesman asked what the trouble was, and the man said that he couldn't answer the question about the cause of death of his father.
The salesman wanted to know why. After some embarrassment, the client explained that his father had been hanged.
The salesman pondered for a moment. "Just write: 'Father was taking part in a public function when the platform gave way,'" the salesman said.