I recently saw a PBS program on the development of ejection seats for todays high speed aircraft. It is my understanding that modern ejection seats last procedural act is to reach up and pull down a mylar screen over your face while keeping your elbows tucked in close to your body, at which point the ejection mechanism fires.

Years ago when I still considered Consumers Union, the publisher of Consumers Reports to be a legitimate organization, (Somehow they seem to have been taken over as some sort of tax haven with limited testing, and more investment advise than previously existed.) they did some testing on life vests, and I seem to recall that some of the vests had a built-in feature that reduced the tendency of water to be washed into your mouth. Does something like a diverter or shield exist on better quality life vests to reduce the potential for swallowing water?

Bountyhunter