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!
Hey, you cry when 
you slice onions, right?
Oigan, lloran cuando cortan cebollas, ¿verdad?
¿Vosotras lloráis cuando picáis cebolla?
Falando nisso, também saem lágrimas
 quando se corta cebolas, não é?