Here's a fun little film a team of UAT Digital Video students produced for the summer 2012 A3F 24 Hour Film Challenge. That's right, they did this in one day from start to finish! And, it was in the Top 20 Films in the Challenge!
Parameters for the challenge were a required line ("Let's get this over with"), a required prop (a box which had to be opened or closed), and a required theme ("a hidden agenda").
More info about the challenge: http://www.thea3f.net