There is entire very funny thread on Anthrogenica dedicated to people ranting that their German-speaking ancestors were not genetically German (which is because of huge cultural Germanization in the past):
23andme's "German Problem":
http://www.anthrogenica.com/showthre...n-Problem-quot
These butthurted Pan-Germanic nationalists and other idiots just don't understand this.
"My ancestor was Slavic and started speaking German - why didn't his DNA change?!"

