Zhang Shuang's sewage pipe was connected into the rice field by a guesthouse owner, causing ten mu of rice seedlings to completely rot. He did not argue or make a fuss, but quietly released ninety thousand frogs into the field. A month later, the guesthouse's rating plummeted, the owner changed to soundproof windows, hired experts, and finally fifty thousand worth of koi fish all died. The frogs were gone, the mosquitoes came, and the guests ran away. The owner regretted and admitted his mistake. Zhang Shuang only said: take down the pipe, pay for the losses, and take back the words face to face. Later, the guesthouse was renamed "Frog Sound Mountain Residence", and the frog croaking became a signature. The best revenge is letting the facts speak for themselves.