There is something magical in such videos - since you are basically making something from nothing. The technique is borrowed from impro theater: you write the screenplay together as a group, with every participant saying one simple sentence on his or her turn. One by one a story is built. Then just film it using the simplest means, and you have a non-trivial movie in a day.

I used this technique in workshops with USANII-Lab in Nairobi, resulting in two short films in two days, the beautifully absurd My ambition for survival is the only way to eat my food and the more polished To painfully swallow the pain of being unnoticed.
As for the video above, that was just reviving this excercise for Ivana and me.