For this reason I always use observational humour throughout my presentations.
For example I love the fun to be had from stupid or error filled road signs. Signs like the STOP sign on the right.
Just a few of these in every talk - always relevant to my topic - help to keep the audience on side and achieve great feedback. And of course good feedback is essential to getting rebooked.
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To read more of my quirky take on life check out "Under Latin Skies" at www.figleaf.org