I am such a geek

This evening I was practicing the left hand of the last movement of Beethoven's Sonata in Eb when a helicopter flew overhead. It approached as I was playing the cadence on Eb. The frequency of the helicopter noise was just slightly off from the Eb. I kept playing the Eb (Eb-2, if you're curious), listening to the dissonance. As the helicopter came closer, it got more in tune with the Eb, then dissonant again as it faded away. It was very cool.