Fellow speaker,
Jeremy Donovan's study of TED talks suggests using humor that laughs at yourself can help in your speeches. (e.g., "I felt so inadequate on that skiing vacation. There I was, struggling to make my way down the "bunny slope" while 5 year-olds were zig-zagging down the "black diamond" hill.")
Deprecatingly,
Tim Wilson
Professional Speech Coach
Free speaking tips at: http://speakingquicktips.blogspot.com