Dans la tête (In the Head) is a short animated film created by the students of the ESMA School of Arts in France.
The story of the film tells of one Betrand Antoine, a rather simple-minded young man, who leaves his girlfriend to enlist in the army. Sadly, Betrand dies in action on the battlefield, but manages to land outside the pearly gates of heaven. Unfortunately, he is denied entry into heaven, as he is yet to complete a certain task. Betrand is sent back to Earth to finish the task (and then die), but things do not go exactly as planned.
You will have to watch the video to find out more.
Note: The video has quite a bit of violence and gore, so be warned.
Link to the official site of the film.