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[0] 4 [Tip] Use humor, carefully and selectively [Don’t] Don’t be dry. Be human. Laugh a little to connect with your audience. When you insert humor you can connect with audiences in ways that convey that you are speaking to them not at them. [Do] 
Engaging lectures often contain a cartoon or two, and an occasional joke breaks down barriers and prevents clock-watching. Effective humor for a lecture steers clear of controversial topics and has at least some relevance to the topic. Humor can also be used to help make key points sink in.
Lisa Nielsen: The Innovative Educator: 10 Do’s and don’ts to using PowerPoint to deliver lectures that don’t suck
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