set the cat among the pigeons 引起纷争；挑起轩然大波；引起麻烦；招惹是非

【例句】
Rather than proposing to bomb North Korea or to impose yet more sanctions on its already crumbling economy, Mr Lee could really set the cat among the pigeons.
与其提议轰炸朝鲜或者进一步制裁其本已摇摇欲坠的经济，李明博真的挑起了轩然大波。

The new vicar's a Marxist that'll set the cat among the pigeons!
新来的牧师是马克思主义者，这下子可要引起麻烦了。