The dangers of buying a cheapo blender, see the recall from the U.S. Consumer Product Safety Commission.
Potential Laceration Hazard due to exposed moving blades when plastic sep separation occurs while blending.
http://www.cpsc.gov/cpscpub/prerel/prhtml12/12187.html
If you own one of these blenders, you should stop using it immediately and return it for a full refund.