Coming back from Lymington yesterday we were just passing the CG office on the Hamble when the engine went all lumpy, fortunately we were only running at 1800 rpm, the outboard looked as if it was trying to jump off the transom. Pulled over to a vacant pontoon and killed the engine, tilted and found a plastic bag about the size of a bin liner wrapped around the prop hub. We managed to remove it and normal service was resumed and yes we threw the bag away when we got back and moored up. Should we have kept it as evidence?