3 sentences

1. 他担心会发生横祸。

   tā dān​xīn huì fā​shēng hèng huò.

   He was worried that an unexpected disaster might occur.

   Source: Dong Chinese Dictionary

2. 这种鲁莽的行为迟早会闯祸。

   zhè zhǒng lǔ​mǎng de xíng​wéi chí​zǎo huì chuǎng huò.

   This kind of reckless behavior will cause trouble sooner or later.

   Source: Dong Chinese Dictionary

3. 既然是你自己闯的祸，就别指望别人来帮你擦屁股。

   jì​rán shì nǐ zì​jǐ chuǎng de huò, jiù bié zhǐ​wàng bié​ren lái bāng nǐ cā​pì​gu.

   Since you caused the mess yourself, don't expect others to clean up after you.

   Source: Dong Chinese Dictionary