Were there any no-nos associated with head movements or gestures in the WC? I would think naming the items in the song while bobbing your head to & fro (ala Eddie Murphy's impression of Stevie Wonder) would be considered legal -- your not singing, but your moving your head to an unheard beat. Then again, if the category would be "Things That Blink", and you said, "your eyes...my eyes" while batting your eyelashes, that might get the buzzer, or would it???
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you can move your head, it wasn't strapped in...
there are many instances of people moving their head in a matter to indicate the other player was on the right track and should keep spitting out guesses.