St. Mark's Plaza in Venice during high tide can flood, as seen here. A dancer appeared out of nowhere with a friend, desperately trying to capture an image of her in the air. After a half dozen tries, they quit, but not before I luckily caught this moment from a low vantage. As quickly as it started, it ended, and they took off despite my effort to show them and exchange email to share it.

NIKON D3S with 70-200mm f/2.8 VRI. ISO 400; 1/1000s @ f/10.