The Power of a Callback

This page provides video demonstrations of callbacks, a presentation technique where speakers refer back to previously mentioned information (such as anecdotes, statistics, or analogies) to reinforce their core message and create a stronger connection with the audience.
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At about 1:50 Bryan references coupons again and watch the crowds huge laugh and applause. They are sharing an inside joke, there is now a connection between Bryan and the audience. CALL BACK = Coupon

In this video the Comedy Without Errors YouTube channel does a great job of breaking down the Callback. CALL BACK = Sprinkle Crack

This one is subtle, but after doing a fantastic job of first introducing the Vegan Witch, Opey Olagbaju focuses on the witch aspect, so when he subtly callbacks to the vegan part at about 5:15 it both reminds the audience and gets a huge laugh. CALL BACK = Vegan