'Sherlock Holmes: A Game of Shadows'

The biggest mystery facing Sherlock Holmes: how come he was so ho-hum at the box office this weekend? 'Sherlock Holmes: A Game of Shadows' was the weekend's top movie, with an estimated $40 million opening, but its performance was underwhelming considering it was expected to score as much as $60 million. Similarly, 'Alvin and the Chipmunks: Chipwrecked' disappointed despite an estimated $23.5 million, second-place debut, since it was expected to gross well over $30 million. On the other hand, the unusual, IMAX-exclusive opening of 'Mission: Impossible - Ghost Protocol' outperformed modest expectations and premiered with an estimated $13 million on just 425 screens, good enough for third place.