Changing a Lightbulb German Style

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.