playing mandolins with a mandolin 

I was playing a mandolin very near another mandolin hanging on a stand, and I thought I heard a harmonic response from the mandolin on the stand, so as an experiment I thought I would try a quick "Cherokee Shuffle" on a Collings F5 playing against a Macica F5 and a Gibson H1 mandola. I boosted the sound about 20% not sure the phone mic was the best to capture this. still I am getting even weirder ideas as we speak.