About his wife's 30-year marriage, only tonight is like a Chinese New Year joke.

Shopkeeper: Tell you what, I'll reduce your price by 30%.

Friend a said: then we will get a 60% discount on two pieces.

Friend b said: yes, that's right. If we buy three pieces, we can reduce the price by 90%. If we buy four pieces, he will give us money ...

I was stunned by my friend's wit …