I'm no longer the only one...

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A similar effect is a voice crack during which a person's voice suddenly and unintentionally enters a higher register for a brief period of time. This may be caused by singing or talking at a pitch outside the person's natural vocal range, stress, emotional tension, or the physical changes associated with puberty. An instance of a voice crack (when associated with puberty) lasts for only a moment and generally occurs less frequently as a person grows into maturity

I wonder what kind of emotional tension Cox is dealing with, considering the topic you guys were discussing.