伤口痛了往上撒盐多刺激心情不好去切洋葱多开心
[shāng kŏu tòng le wăng shàng sā yán duō cì jī xīn qíng bù hăo qù qiè yáng cōng duō kāi xīn]
This humorously exaggerated expression translates as 'How stimulating it is to sprinkle salt on a wounded place; when I feel down, slicing onions really cheers me up,' implying using self-inflicted pain or tears from cutting onions as emotional release or distraction.