Ask for a quick brain trick

One day, a group of small animals fled by boat. As a result, the boat drifted and found that it was overweight. They made an idea. They took turns telling jokes and threw one of them into the water as long as he didn't laugh. The monkey told a story and everyone laughed, but the pig didn't laugh, so everyone threw the monkey into the water. The donkey went on telling jokes, and no animals laughed after he finished. At this time, the pig smiled, and everyone asked why the pig laughed. The pig said: The joke told by the monkey is so funny!

O(∩_∩)O~ is like this.