The third trailer has arrived for the YouTube compilation movie Life in a Day, which will hit theaters nationwide on July 24. Click on the video player below for the latest glimpse at this movie from director Kevin Macdonald, which features submissions from thousands of YouTube users.

YouTube joins world famous filmmakers Ridley Scott and Kevin Macdonald in asking people around to world to help them create the first user-generated feature-length documentary film shot on a single day - July 24, 2010. Life in a Day is a historic global film experiment that enlists the global community to capture a moment of their lives on Saturday, July 24 and to upload that footage to www.youtube.com/lifeinaday.

Academy Award-winning director Kevin Macdonald (State of Play, The Last King of Scotland, Touching the Void) will direct, bringing together the most compelling footage into a feature-length documentary film. The project will be executive produced by Ridley Scott (Robin Hood, Gladiator, Black Hawk Down) and produced by his company Scott Free Productions. Individuals whose footage makes it into the finished film will be credited as co-directors and 20 of these contributors will be flown to the 2011 Sundance Film Festival for the film's world premiere.