笑不出海绵宝宝的悲伤
[xiào bù chū hăi mián băo băo de bēi shāng]
'笑不出海绵宝宝的悲伤' (Xiao Bu Chu Hai Miang Bao Bao De Bei Shang) suggests feeling the same sorrow as SpongeBob (or the sponge baby). The person uses SpongeBob’s character to express an inability to laugh despite sadness.