What makes them reacts so funny, surprising, or shocking

"This is Winona Ryder; an actress who reacts during a news conference for the film The Iceman at the 37th Toronto International Film Festival, September 10, 2012." – That's the caption that comes with this photo. But what makes her reacts like that? A stupid question, or a rude question? Did she just realize that she left the stove on, back in Los Angeles? Or is this just a look of mock surprise? She is an actress, after all. 

“U.S. actress Susan Sarandon reacts during a news conference to promote the film Cloud Atlas during the 37th Toronto International Film Festival September 9, 2012.” Again with the “reacting” – that word is really used a lot in sports photography, you know. But what happened here – a shocking suggestion, an unpleasant smell, a question about U.S. politics, maybe? Inquiring minds want to know, as they say.

The captions attached to the photos on this page include the name of a person, and the details of the event she is attending.

Unfortunately, there is no additional information to explain the very expressive expressions on the faces of the subjects.

Photographers try to get the best pictures that they can. Journalists report on the words, share the quotes. But wherever they are, they can’t or won’t write down every word, especially at a relatively fluffy event like a press conference for a movie. These events can get noisy and out of control too, with everyone trying to talk at once.