A son took his old father to a restaurant for an evening dinner. Father being very old and weak, while eating, dropped food on his shirt and trousers. Other diners watched him in disgust while his son was calm.
At that time, an old man amongst the diners called out to the son and asked him, “Don’t you think you have left something behind?”.
The son replied, “No sir, I haven’t”.
The old man retorted, “Yes, you have! You left a lesson for every son and hope for every father”.
The restaurant went silent.