Karma for doing stupid things.
One of the most famous Chinglish phrases to go viral globally. It was even included in Urban Dictionary in 2014. It perfectly captures the sentiment of 'fuck around and find out'.
Derived from the Chinese internet slang 'Bù zuō sǐ jiù bù huì sǐ'. 'Zuo' (作) means to act silly or daringly for attention, or to look for trouble. The phrase means that if you don't do stupid things, you won't suffer the consequences.