I was on a QF flight in 2003 (SYD/HLZ) and the crew had refused to get back in the plane for the turn around flight (3 hours flight time). We were informed while taxiing that the seatbelt sign will remain on for the complete flight and there would not be any service at all and the FA's would remain seated for the entire flight as well. It was the worst turbulence I have ever encountered.