Sport: You can't be my friend if you're not my friend.
Ole Golly: Your father has a high pressure job.
Harriet M. Welsch: What's a high pressure job?
Ole Golly: It's when you don't get to do what you want to, and when you do, you don't have enough time for it.
Harriet M. Welsch: Do spies have high pressure jobs?
Ole Golly: Only if they get caught.
Harriet M. Welsch: I never get caught.
Janie's Mom: Janie! I am sick to death of this mad scientist baloney! Look at this! Look at this.
Harriet M. Welsch: Carrie Andrews thinks she's cool because she spent her summer vacation growing boobs.
Harriet M. Welsch: I want to learn everything I can, and I write down everything I see. Golly says if I want to be a writer someday, I better start now, and that is why I am a spy.
Ole Golly: Just because you're going to be alone now doesn't mean the world stops turning. You'll keep writing in your notebooks and when you're grown up and you publish your first novel, I'll be first in line at that bookstore, getting an autographed copy.
Harriet M. Welsch: The only thing worse than being Marion Hawthorn, is wanting to be Marion Hawthorn.
Frankie Hong Fat: Speak English.
Ole Golly: You remember, a good spy can get in there and fight. Goodbye, Harriet the Spy.
Sport: This stuff is beyond crap. It is what crap wants to be when it grows up.
Ole Golly: Good friends are one of life's blessings. Don't give them up without a fight.