Had a dragoon in ST yesterday that while everyone was getting into position around sides of room, he just started running right across from one end to the other, right through middle and through boss and kept going like he accidentally turned on auto-run and couldn't be bothered to stop himself which made for messy start to the fight. Like others have said I also have not noticed ninjas mostly doing dumb things, it's still around even split between all classes which do dumb things from what I have seen.