Emma Watson stars as Sam in The Perks of Being a Wallflower, and we caught up with the actress, along with the film's director, Stephen Chbosky, at the US junket. Stephen explained the moment when he knew Emma was perfect for the part, while Emma opened up about what an emotional experience watching the film was, and also revealed what scene gave her and co-star Logan Lerman an unspoken connection. The Perks of Being a Wallflower hits cinemas Nov. 29.">