2 sentences for 作怪 (zuò​guài — make mischief)

1. 也许是荷尔蒙作怪。

   yě​xǔ shì hé'ěr​méng zuò​guài.

   Maybe it's the hormones.

   Source: OpenSubtitles

2. 我怀疑有人在暗中作怪，破坏我们的合作。

   wǒ huái​yí yǒu rén zài àn​zhōng zuò​guài, pò​huài wǒ​men de hé​zuò.

   I suspect someone is working behind the scenes to undermine our cooperation.

   Source: Dong Chinese Dictionary