Eliza (crying): Mama I am crying.
Me: I know sweetie, but there is no reason to cry
Eliza: But Mama these are real tears
Me: Are there other kinds of tears?
Eliza: Yes Mama (still crying). There are toy tears.
Me: What are "toy tears."
Eliza: Those are the tears that come when I really really really need a new toy.
Great. Eliza has invented a whole new emotion.