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!
It's complicated enough with happy 
tears and frustrated tears,
Es suficientemente complicado con lágrimas de felicidad y de tristeza
Ya es suficientemente complicado con lágrimas de felicidad y de tristeza
Já é complicado com 
lágrimas de alegria e frustração,