Just how powerful are So You Think You Can Dance judge Mary Murphy's lungs? We grabbed a decibel meter, plugged our ears, and let 'er rip.

The incredibly loud Mary Murphy: 125 decibels

A jet plane taking off: 120 decibels

Rock music: 110 decibels

A vacuum cleaner: 70 decibels

A quiet library: 30 decibels


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