You've probably heard this one before: Why are there life jackets on an aeroplane but no parachutes? The answer appears to be that no special training is required to operate a lifejacket, but parachutes are potentially dangerous. I don't really buy that explanation, since they DO give us special training to use the lifejacket (and oxygen masks etc.). Overall, I think I'd rather have the parachute.
But my real question is this: When I'm flying from Shannon to Dublin, why do I get a lifejacket and a lifejacket speech? I would think it's very unlikely that we'd crash into the sea.