I was flying a 206B on one of my early revenue flights and I had two big water bottles on the two window seats in the back. I seatbelted them in with shoulder straps and everything but imagine the look on my 100hr face when one of the jugs fell off the seat and banged into the ground. It was a very loud bang the machine lurched quite good haha. I almost bottomed the poll before clueing in to what happened.