Smile

1. The Prophet (sallallahu alaihi wa sallam) used to smile
[Abu Dawood]

2. Joking
The Prophet sallallahu alaihi wa sallam would stand and his Companions would talk about matters concerning the days of ignorance, and they would laugh while the Prophet sallallahu alaihi wa sallam smiled. [Muslim, 1413]

3. Make your dear ones feel good!
Hadhrat Fatima (radhiallahu anha) said, The Prophet sallallahu alaihi wa sallam told me something secretly during his fatal illness and I laughed. [Bukhari, Vo. 8, Chapter 68]

4. Jesting with your family
Ibn Mas'ud (radhiallahu anhu) said: ‘Mix with people on condition that your religion is not jeopardized, and be jestful with the family.’ [Bukhari]

5. Laughing
The Prophet (sallallahu alaihi wa sallam) said: ‘I know the last of the inhabitants of Paradise to enter it and the last of the inhabitants of Hell to come out it. He is a man who would be brought on the Day of Resurrection and it will be said: Present his minor sins to him, and withhold from him his serious sins. Then the minor sins would be placed before him, and it would be said: On such and such day you did so and so and on such and such day you did so and so. He would say: Yes. It will not be possible for him to deny, while he would be afraid lest serious sins should be presented. It would be said to him: In place of every evil deed you will have a good deed. He will then say: My Lord! I have done things that I do no see here.’ The Prophet sallallahu alaihi wa sallam laughed. [Muslim, Vol 1, 365]

6. Make parents Smile and laugh
A man came to the Prophet sallallahu alaihi wa sallam and said: I came to you to take the oath of allegiance to you on emigration, and I left my parents weeping. The Prophet sallallahu alaihi wa sallam) said: Return to them and make them laugh as you made them weep. [Abu Dawood]