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SIMI VALLEY, CA - SEPTEMBER 16:  Republican presidential candidate Donald Trump speaks during the presidential debates at the Reagan Library on September 16, 2015 in Simi Valley, California. Fifteen Republican presidential candidates are participating in the second set of Republican presidential debates.  (Photo by Justin Sullivan/Getty Images)
SIMI VALLEY, CA - SEPTEMBER 16:  Republican presidential candidate Donald Trump speaks during the presidential debates at the Reagan Library on September 16, 2015 in Simi Valley, California. Fifteen Republican presidential candidates are participating in the second set of Republican presidential debates.  (Photo by Justin Sullivan/Getty Images)

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    The many faces of the Republican face-off

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The many faces of the Republican face-off

Here are the oddball debate moments... from mystery stud to funny faces. CNN's Jeanne Moos watches the face-off with the sound off.

The many faces of the Republican face-off

Here are the oddball debate moments... from mystery stud to funny faces. CNN's Jeanne Moos watches the face-off with the sound off.