打我一巴掌看我疼的多美
[dă wŏ yī bā zhăng kàn wŏ téng de duō mĕi]
It may sound masochistic and confusing to foreigners, it suggests self-punishment for a mistake one thinks they've made; there might be an expectation to learn from pain inflicted by others as punishment but presented as an act to appreciate 'beauty' coming from learning to endure hurtful relationships or experiences.