When I was 17 driving my first car late one night in Cardiff city centre fully loaded with my mates I turned left at a set of traffic lights, ....only to then realize it was a no left turn set of traffic lights with oncoming traffic driving straight at me. Had to swerve to avoid one car, then another car swerved to avoid me.
Did a quick U-turn and drove off feeling very stupid with typically my mates pi**ing themselves with laughter.
I can laugh about it now but at the time it was a very silly mistake that I felt really stupid for making.
Oh well you live and learn, ...and hopefully become a better driver because of it.