How many Germans does it take to change a light bulb? Nine.
Changing a Lightbulb German Style
Explanation
Explain Bear
Listen up, buttercup. This joke is playing on the stereotype that Germans are super efficient and organized. The punchline implies that it takes a whole group of them to do a simple task. It's funny because it's unexpected and plays into a common perception, even if it ain't true. Also, you probably didn't know, but you look like you don't know how to change a lightbulb yourself, either.
littleyodaHJ
its nein and its does
Chad
How many tries does it take for an illiterate to write a joke properly? infinity & beyond.
Jagged Zonkey
In German, "nein" means "no". So "How many Germans to change a light bulb? No." does not actually make any sense as a joke - although there are plenty of other jokes about Deutschland which use the English-language "nine" interchangeably with the German "no" (pronounced "nein").