Oversmart got punished!!!

On a shiny morning, a merchant loaded his donkey with bags of salt to go to the market in order to sell them. The merchant and his donkey were walking. After some time, they reached a river on the road.
Due to slippery road, the donkey slipped and fell into the river and noticed that the bags of salt loaded on his back became lighter.
The merchant became panic and returned home. He again loaded his donkey with more bags of salt. As they reached the slippery river, now again, the donkey fell into the river and wasted all the bags of salt on its back.
The merchant understood the donkey’s trick. He then returned home again. Thought a trick to teach his donkey a lesson. He loaded his donkey with bags of cotton.
The donkey again decided the same. On reaching the river he again fell into the water. But instead of the load becoming lighter, it became heavier.
The merchant laughed at him and the donkey learned a lesson.