I have to say that I wish all site briefings I have had were always this thorough as some of the ones described above. On a recent boat trip in S. Florida, the capt got on a few people's cases (in a kind yet direct way) when they were too busy with gear and not listening to his portion of the briefing. I am glad he did it partially because it demonstrates a commitment to safety, but more importantly because I cannot process everything he would have been saying with people nearby holding side conversations or making too much noise with gear.