Hài qún zhī mă 【 害 群 之 马 】

It was about four thousand years ago. Huangdi (Yellow Emperor), the first legendary ruler of China, went to the countryside to visit an old friend with his entourage. They met a boy keeping watch over a herd of horses on their way.

Huangdi asked the boy, "Do you know the way to my friend's village far away from here?"

The boy said yes.

Then the emperor asked, "Do you know my friend?"

The answer was yes again.

Huangdi thought the boy was broad-minded. So he asked him, "Do you know how to rule a country?"

The boy said, "There is little difference between ruling a country and watching over a herd of horses. You simply have to drive the wild horses out of the herd."

The emperor left, brooding over the boy's words.

The idiom is taken from what the boy said and is used to describe anyone who has a bad influence on his peers.
    Méi     dà     méi     xiăo
【     没     大     没     小     】
Be impolite to one’s superiors or elders
    Méi     shì     zhăo     shì
【     没     事     找     事     】
Ask for trouble; make a fuss
    Rén     yăng     mă     fān
【     人     仰     马     翻     】
Both men and their horses are fallen – locked in fierce fight or utterly routed
    Rén     qù     lóu     kōng
【     人     去     楼     空     】
The dear one is gone and the room is empty – old sights recall to mind fond memories of the past.
    Tiān     zhī     jiāo     zǐ
【     天     之     骄     子     】
God's favored son; unusually lucky person
    Tiān     xià     wú     shuāng
【     天     下     无     双     】
Unparalleled in the world; unique