videos of 4 min showing a cool pharo XP

I would like that we all brainstorm about videos of 4 min showing a cool
pharo XP

I think about
     - haltif implementation
     - on the fly changing somehting
     - chipmunks
     - earth shadder
     - picasa scripting.
     ….
     - rotating cubes

I think that doing some teasers in the GT vein is important.