Another great example of supply demand issue of a security would be the unloading of VIFL shares when MDS Canada was selling like crazy.
Obviously, timing should only be used in price to value issues, but, these behavioral movements (based on something as simple as when people get paid) are certainly interesting to consider. Additionally, there is always the chance that terrible news could come out, and tank your investment, when exposed to a limited time's worth of holding. Whereas, these issues are more able to iron out over the long haul.
Disclosure: None. This is not investment advice. Always do a ton of your own research when doing anything that I talk, write, or think about.