I seriously think driving schools should emphasise more on
roundabouts to prevent more of such idiocy.
I was at Suntec's fountain of wealth roundabout, on the left-most
lane (lane marking showed either turn-left or go-straight).
Suddenly this Lancer from the lane on my right abruptly turned left
in front of me while I was travelling straight. Understandably, if
my lane allowed going straight, there was no way his lane could
have allowed turning left.
I had to jam brake to avoid hitting him/her, and needless to say I
held my horn blasted. Damn fuelled.