You Learn Something New Every Day
Today's question: what exactly is a pretensioner? Well, it's...
A large, complicated and difficult to fit gadget that sits under your seat and pulls the seatbelt tight when you have a crash (www.howstuffworks.com) Apparently, Corsa ones come with explosives in them.
Fairly essential in a "not dying while driving down the A1 to Nottingham" way, particularly if your seatbelt is prone to spontaneously popping out of the holder at inopportune moments, such as when you're pulling in to the outside lane.
Educational, isn't it?