Ha ha! We are just poking a little friendly fun at Germany, which is famous for enjoying a good joke [...] Here is just one hilarious example of what we are talking about:

First German: How many Polish people does it take to screw in a light bulb?
Second German: I don't know! How many?
First German: Let's invade Poland and find out!
Millions of Other Germans: Okay!

Dave Barry's Only Travel Guide You'll Ever Need (1991)