hmm.. but there's too many obstacles that will interrupt or disperse the movement of the wind.. if a butterfly's fluttering does cause a typhoon somewhere.. imagine wat we could do just by fanning ourselves. hah..

Maybe it doesn't only apply to physical happenings. Think of the psychological and social aspect of it. It may apply more easily. A simple statement leading to a misunderstanding and den an end of a long lived friendship.  A simple innocent cause, a major effect. Things simple as throwing a banana skin and den leading to a fall and a death is an example... Hmmm.... I'm crapping... LOLZ... People... Try watching The Butterfly Effect. Its nice.

Chaos theory or the butterfly effect are both of the same thing. Its something about a small gesture or action that can lead to drastic long-term results. Natural phenomenons (eg: hurricanes) portray the definition of the chaos theory well.

The butterfly effect movie shows about a man who could "change" fragments of his past but the consequences of his actions were unexpected. Doesn't really explain the true meaning of the butterfly effect but it's still a great show.

Khengsoon's examples are pretty much clear cut to me.
 

Hey..  Kheng Soon, or anyone.  Start the ball rolling by posting some articles regarding Chaos Theory, and lets go into this topic.  Interesting isn't it? 

Here is one video about a chaos theory regarding the randomness of the landing point of attractions:

www.youtube.com/watch?v=Qe5Enm96MFQ

I don't know why is such consider a Chaos Theory, however it is.