The page below, from the Universe of Utah’s Genetics Science Learning Center, shows you how easy it is to extract DNA strands from any living thing (but stay away from living things that might be pissed at you for liquefying a half a cup of them in a blender).
The rest of the Learn.Genetics site is very well done and has a number of interactive experiments and models.
How to Extract DNA from Anything Living
More:
Other DIY DNA coverage on MAKE
I showed this site to my dad, who himself is a geneticist. He replied with “My lab uses blenders all the time!” and sent me this snapshot: http://www.nathanrosenquist.net/host/lab_blender.jpg