I was flying back stateside from Germany. We were landing first at Logan in Boston. It's an eight hour flight and near the end it was cloudy as hell and the turbulence increased to a level creating concern amongst the passengers. I was looking out the window, and the clouds broke and I saw a patch of rapidly moving ocean maybe 30 feet below. Alarmed, I yelled F×c#, WE'RE GOING IN! A few passengers screamed. Seconds later we hit the runway. Never having flown through Logan, I didn't know the runway extends out into the ocean. Waiting in line to exit the plane was the longest week of my life.