Half a croissant, on a plate, with a sign in front of it saying '50c'
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Hand Raising Nod Inflatable Bladder

 Nod inflatable air bladder that raises the arm, deflated by head shake.
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An air bladder fills with air and raises the weaer's arm, pressurized by constant head nodding. Head shaking releases air lowering the arm. The inflation pump is located under the chin disguised as a neck beard or oversized bow tie. The deflation valve is opened and closed by the quarter rotation of the head.
—rcarty, Mar 11 2013

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       Brilliant. The vigorous nodding conveys the impression of understanding, so the professor is more likely to call on you so as to hear your insightful question.
—ytk, Mar 11 2013
   

       Which arm? [+]
—pocmloc, Mar 11 2013
   


 

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