1. Don’t use bad or restricted language.
2. Don’t focus on a specific gender, racial or ethnic group.  No one will be offended if you focus on yourself.
3. Don’t use written humor if it distracts people from the lesson, only use it if it makes the lesson better.
4. Don’t use humor that mixes up your message.
5. Do be have the frame of mind to write, and  use your imagination.
6. Do check your work.
7. Do make a link between yourself and the audience.
8. Do remember to be surprising.

References were:  L. Audrieth, Anthony "The Art of Using Humor in Public Speaking" 1998.