How to know who is Jewish

Answer: Because air is free. (Because the air is free)

You have to know two cultural points to understand this joke: 1. Jews in the eyes of Americans have a Big aquiline nose. 2. Jews are shrewd and stingy.

If you have watched TBBT, please continue reading:

(Howard’s nose is big and curved enough. His mother is also very smart. I remember one episode when Howard wanted to go to dinner and his mother asked He went to a restaurant he didn't want to go to just because she had a coupon)

Many of us Chinese have this concept: Jews are extremely smart. In fact? I don’t know if this is true for all, but my Jewish friends in the United States are very smart and very business-minded. Starting from the image of Jews created in Leonardo da Vinci's "The Last Supper", Jews have left such an impression on Westerners: they have a big aquiline nose. Shakespeare's "The Merchant of Venice" further strengthened people's impression of Jews as "shrewd, calculating and greedy". So in this joke, the cultural meaning behind "the air is free" is the shrewdness and stinginess of the Jews.

I remember one time a friend took me to a bar for a drink. He told me that the wine was free, and I jumped for joy. He then said to me: "Are you Jewish or something? (Are you Jewish or something?)". Don't make jokes about other races easily. In the United States, generally, it is safe and harmless only to make jokes about your own race. Then you ask, how can your friend make jokes about Jews? The answer is, that friend of mine is a Jew. ^_^

Okay, let me test you with a joke to see if you understand it:

Answer: Free Pork.

Give me more Here is a joke about the Jews:

Answer: Canoes tip. (Canoes can tip over but Jews will not tip over)

Speaking of which, here is a tip for Chinese people traveling to the United States. Wake up. Tipping is required when dining in American restaurants. The amount consumed is 15% to 20% of the meal checkout figure. Don’t forget it.

Okay, the next joke is about Jewish mothers. You said, huh? There is also a saying about Jewish mothers, yes! That’s right!

A: Is anything all right? (Is there anything that satisfies you?)

The image of the Jewish mother shown in this joke is very carefree and unreasonable. Very difficult to serve. Because in English, when waiters serve customers in restaurants, they often ask: "Is everything alright?" Usually it's just a question, and I don't expect you to really find fault. But in this joke, "everything" is changed to "anything" to indicate that there is one thing that you will not find wrong?

There are other sayings about the Jewish mother:

Jewish mothers are a bit like our Chinese parents. They have to personally handle everything from the birth of their children to their adulthood, marriage, and childbirth, and they have a strong sense of participating in political affairs. Their level of involvement and participation in their children's marriages is definitely no less than that of our Chinese parents. This is also how Americans view Jewish mothers.

(Howard and his mother completely meet the above characteristics. It seems that the screenwriter also wants to make fun of Jews and cater to the audience’s stereotypes.)