Sayyiduna Hasan Basri radiyahallhu ta'ala anhu saw that a person was laughing and asked him, ‘Oh young man! Have you crossed the bridge of Siraat yet?’ He replied no. He was then asked. ‘Do you know whether you will go to Heaven or Hell?’ He again replied in the negative. He radiyahallhu ta'ala anhu said, ‘Then why this laughter? You should not be laughing when you are aware of the difficulties ahead of you and you are unaware of your final destination.’ From that time on, this young man was never seen to laugh again.[1]
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[1] Akhlaq Us Saliheen, Pg 44, Maktaba Tul Madina, Baab Ul Madina, Karachi
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[1] Akhlaq Us Saliheen, Pg 44, Maktaba Tul Madina, Baab Ul Madina, Karachi