没忧桑的不是我是海绵宝宝
[méi yōu sāng de bù shì wŏ shì hăi mián băo băo]
Saying 'if I'm not sad, then I must be SpongeBob,' combining pop culture reference (SpongeBob SquarePants, an animated character famous for being happy-go-lucky and carefree) with emotional self-reflection.