When I was younger, my mom took my brother and myself to see a movie. I was around ten or twelve, I think; my brother is two years younger than I am. I don't remember what the movie was, or why Mom had taken us by herself. No, what sticks in my memory is a conversation we had in the lobby. I'm paraphrasing, of course, but it went a bit like this:
Me: "Can we get popcorn?"
Brother: "Mmm. Popcorn."
Mom: "No, we don't have money for that."
Me: "Okay." (Heads for snack counter)
Mom: "Where are you...?"
Me: "I've got some money."
Brother: "Wait, that's not fair.
I don't have any money."
Mom: "Okay, fine, here's some money."
Me: "Wait, that's not fair. You'll pay for his popcorn but not mine?"
Mom: (Sighs) "Okay, here's some money for you, too."
Us: "Thanks!" (Head for snack counter)
Mom: "Wait, how did I just end up paying for popcorn?"
The scary part is, it was completely innocent. We really didn't set out to grift our mom. Sure worked out that way, though.