We saw a part of the bizarre fantasy world inhabited by Walter Mitty (Ben Stiller) in the first poster for The Secret Life of Walter Mitty last week, where the character was literally walking on air. Today, we have yet another one sheet, showing this timid photo manager literally riding a shark. This adaptation of James Thurber's novel follows the title character, as he goes on an adventure after a photo negative goes missing. If that wasn't enough, 20th Century Fox has also released four new photos featuring Ben Stiller as Walter and Kristen Wiig as Cheryl.