Fat Girl (aka A Ma Soeur!) is French director Catherine Breilliat's caustic version of a teen film. It's about two young teenage sisters - Elena, who is pretty and sexy, and Anais, who is fat and ignored. On holiday, Elena is seduced by a handsome young Italian scoundrel. It's a modern classic.
The key scene in Fat Girl take place after dark in the girl's bedroom. The Italian suitor gets in, and has sex with Elena, while Anais is forced to listen in the next bed. This scene plays out in real time, and mercilessly reveals the craven behaviour of supposedly 'nice' young men who are desperate to have sex. This is the flip side of American Pie and its ilk, and is uncomfortable viewing, especially as Breilliat makes us share Anais's revulsion at it all.
The next day, the girls and their mother return home, but en route there is a very violent incident awaiting them. It may be Anais's embittered fantasy, it may not, but its inclusion is crucial to the good boy/bad boy debate the film is having. This scene is censor cut in the UK version, and there is an apology for this inside the box. By contrast, the US Criterion version is uncut, has superior picture quality, and is well worh picking up.