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What does a joke mean?

Four aliens were airdropped to China:

The first one came to Beijing, and the aunt of the neighborhood Committee immediately called: Comrade public security, we have spies here!

The second one landed in Shanghai, and the Shanghainese were very happy: this thing is fun and should be sent to the zoo to sell tickets.

The third one fell to Guangdong. Cantonese: I have never eaten this kind of thing. Take it to make soup!

The fourth one falls in Chengdu. Chengdu people: There are only three 1 left. Come and play mahjong!