Yup, summary is about right. Being funny is a great point. Could probably expand on that in another post. I've heard before that you're not supposed to try to

Yup, summary is about right. Being funny is a great point. Could probably expand on that in another post. I've heard before that you're not supposed to try to be funny at the last minute in a talk/essay if you're not funny in general, though, so that advice is a tricky balance. I think being funny and joking around during presentations comes from feeling comfortable with your audience.