Having been sat in a business class seat only yesterday, taking my in-flight rest (yes our company never thought about bunks) we hit a patch of moderate turbulence, the guys up front stuck the sea belts sign on and within 5 seconds someone was on their way to the toilet.
The blatant disregard of the SB sign really irks me sometimes, maybe these 7 wouldn't have been injured if they'd have been strapped in.