pkpk was crying last night and now her eyes are swelled up.  Tears are strange; you cry when you're happy and when you're sad.  This discussion of tears reveals a terrifying plot!
'Cause you cry both when you're 
happy, and when you're sad.
Porque lloras cuando estás feliz y cuando estás triste.
Porque lloras cuando estás feliz y cuando estás triste.
Por que você chora quando
 está feliz e quando está triste?