People have been ignoring the "Fasten Seat Belt Signs" much longer than just the last 2-3 years. Way back when I started flying in 1971, people still ignored them, maybe not as much as now, but it still hapened. The Captain really may not have much choice, if in his educated opinion he sees what may become a problem, then he is obligated not only by law, but by his company's policy to turn on the seatbelt sign. After all, if he does turn off the light, you jump up, for whatever reason, then you hit an airpocket - of course you are going to probably fly up to the ceiling and possibly get hurt. Now in reality of course nobody wants you or anyone else to get hurt, but it may just happen. God forbid it does, then you as the same person that wanted the light turned off in the first place are then complaining that the pilot should have never turned off the light. And of course, most people then want to sue the living daylights out of the airline when they should have used good judgement in staying in their seats. You are completely right when you say that sitting down across the "pond" is difficult, but would you rather that happen or would you rather hit the ceiling? Take my word for it, sitting down is much better, I've hit the ceiling and it really hurts(broke my left forearm and the left thumb at the same time, on the same flight a male flight attendant in the back broke his collarbone and the girl working with him put a hole in the ceiling with the top of her head). Now personally I'd rather have been sitting down, how about you?