This an exsample of a German Joke to see if they really do have a sence of humour
"Mateus und Mitzi are ze typical berliner urbenites to move to ze country und buy ein farm.
Zey are troubled when zey find zey cannot tell the difference betveen 2 cows und dis keeps zem avake for a lot of ze night.
Next morgan, Mateus vakes Mitzi up un zays...."I have it! Ze black vone is 2.3 centemeters higher zan the vight vone."
(lifted from "Clare in the community" radio4)