What is a classic rap line of Wei Zi and Er Kang in Huanzhu Gege?

Wei Zi: Erkang, don't be sad. Erkang: I'm not sad. As long as you are not sad, I won't be sad. Wei Zi, promise me not to be sad. Wei Zi: Erkang, I'm not sad. I'm not sad. Don't be sad. You see, I'm not having a hard time. Don't be sad either. Don't be sad, Erkang! Erkang: OK, OK, I'm not sad, but Wei Zi, you must not be sad. Sadness is over! Wei Zi: Well, let's not be sad!