Why Grownups Don't Cry

I loved this post so much I'm reposting the entire thing, from Australian novelist Penni Russon:

Why don't grownups cry?

Recently you said to me "Why don't grown ups cry? Why don't you ever cry?"

Amazed, I said "I cry! You've seen me cry."You said, "Have I?" And again, incredulous, "Have I?"

I have sat down on the floor beside you and sobbed, from tiredness or grief or anger or hunger or because my blood burned with sugar. I have cried from hopelessness, because I am terrible at...