Glasgow Flyer's comment about a video circulating of what happens if the a/c has to stop shrpish - makes me think that we should have an official video showing this kind of information when in the departure lounge.
Folks are sitting around doing little and many airports have advertising $hit on the screens. Perhaps we could have examples of what happens if you don't stay in your seat. This could also cover the reasons for "Keep your seat belt lightly fastened at all times, in case we meet unexpected turbulence" as well as taxying.