And now for one our stranger idioms.
Are you a goody two shoes?
Probably not, if you are one of my students!
Goody two shoes always do their homework and go to bed at a sensible time. They don't smoke, don't drink - they are just perfect people and usually annoying!
Here's a song of the same name by the post punk Adam Ant. He was very pretty but sadly for him, he lost his hair, his looks and had a nervous breakdown - I know the feeling!