The shaky video is some weird stuff with youtube sometimes and not the recording...............
This is a part of the reprap funbot build guide.
The video where created to help people new to 3d printing diy.
A lot of people new to diy 3d printing usually contact me after they have done these mistakes and asks for help.
So I thought it would be a good idea to post a video about the most common dangers.
http://www.thingiverse.com/thing:560343