Every petrol station forecourt you pull into these days has signs telling you to turn off your mobile phone. Have you ever seen anyone turn off their mobile phone on a petrol station forecourt? Me neither. And exactly how many petrol stations have you heard of that blew up as a result of a still-turned-on mobile phone? Same here. So what's that all about, then?
And, come to think of it, how many people's lives have been saved, do you reckon, by paying attention to flight attendants when they demonstrate how to don a lifejacket? In fact, have you ever heard of anyone surviving a plane crash into the sea and actually getting to use their life jacket? I'm sure it must have happened at some point, but I've never heard of it.
It seems to me you'd be much better off with an airbag.
Or a parachute.