if the video is too long to watch for you, or a good book on the scientific method(sagan - demon haunted world, goldacre - badscience) is beyond your desire to educate yourself then hopefully a simple graph will ram the "causation/corellation" thing down your throat.

http://www.seanbonner.com/blog/archives/001857.php

ty for the video link btw, may use that in class sometime.