When I grow up...

Garrett: Mommy, I finally know what I'm going to be when I grow up! A movie director!
Me: Cool. How about you Mary?
Mary: I don't know yet.
The next day.......
Mary: I know what I am going to be now. I am going to be a diamond and people will mine for me. (Mary has recently taken an interest in diamonds. She'd like to collect them.)
Me: Oh wow. Love the metaphor, Mary.
Garrett: It's going to be dark down there.