2 sentences for 疯话 (fēng​huà)

1. 他烧得很厉害，嘴里一直在说些听不懂的疯话。

   tā shāo de hěn lì​hai, zuǐ lǐ yī​zhí zài shuō xiē tīng bù dǒng de fēng​huà.

   He has a very high fever and has been babbling incoherently.

   Source: Dong Chinese Dictionary

2. 别听他在那儿说疯话，这种事根本不可能发生。

   bié tīng tā zài nà​r shuō fēng​huà, zhè zhǒng shì gēn​běn bù kě​néng fā​shēng.

   Don't listen to his nonsense; something like that could never happen.

   Source: Dong Chinese Dictionary