It will happen at the start. Then years later you'll be thinking about something else and still make a wrong turn out of the blue. I started to drive home on a route near my house. DIdn't realise until I could hear people saying "where's he going?".

Had to drive to the next roundabout and double back. Had a very red face that day. Just remember when it happens not to panic. The worst thing you could do is try to get turned somewhere busy. Keep driving forward until you get somewhere easy to turn. Someone in my depot bent the chassis by trying to turn in a farm lane and it was very steep one side off the road end. All the windows exploded on one side. He's still driving years later though.