口中蚤虱

Explanation: Analogy can easily destroy the enemy, like the mouth of the lice. It is also for "the mouth of lice." 　　Source: "Han Fei seven patients" (the king) to the Pro Dongyang, Han Zhang is also the mouth of lice. " 　　Examples: Captain Han Wei Jin said: "Viagra, a new chamber of swallowing Hulu, the same ~。"(" Han Chuan Wang Mang")