I prefer the word “coagulates”. As demonstrated by this in-car conversation I had with the kids yesterday:
Alex: “Zoe, what do you want to be when I grow up?”
Zoe: “A My Little Pony”
Alex: “Can little girls actually become plastic ponies?”
Zoe: “No, Daddy. Don’t be silly. I want to be a real My Little Pony. Once I’m old enough to leave home, I just have to wish for it.”
Alex: “Oh. I see. James, what do you want to be when you grow up?”
James: “An eggy!”
Alex: “You want to be an egg?”
James: “Yes”
 Zoe: “Daddy, what do you want to be when you grow… oh, wait, you’ve already grown up.”