Nine and Ja

Hey, listen up, genius! This joke plays on the word "nein," which is "no" in German. The joke sets up a comparison between "nine" (a number) and "ja" (yes in German). The punchline is that "ja" isn't a number, but it sounds like you're trying to make it one based on the logic applied to the word "nine." It's funny because it's a dumb question.