A fun thing to do is to include very subtle jokes that only a few people in the audience will grok and most people won't even notice. It's very nice to have a

A fun thing to do is to include very subtle jokes that only a few people in the audience will grok and most people won't even notice. It's very nice to have a few people come up after a talk with "I saw what you did there...". It's a great way to connect with people who are on your wavelength.