"Daddy, I want a train set for Christmas."
"I want a train set. Trains are cool."
"Really? A train set? I think your grandpa wanted one once upon a time, too. Even got me one for Christmas once. It was kinda cool, I guess, but you realize it just goes over the same path over and over and over again, right?"
"I don't care. They're cool."
"They're pretty expensive, too. And daddy lost his job this year. This would be very difficult for us to pull off, son. Are you sure you want a toy that doesn't really do much outside of speed along the same track over and over again? "
"Daddy! Trains are cool. I WANT ONE!!!"
"Okay, bud. I get that. But why?"
"Because trains are cool, dad."
"Wouldn't you want something that you can be really flexible when playing with? Maybe a really nice Hot Wheels set? Or even a video game?"
"No, daddy! I want a train!"
"But why, son?"
"Because they are cool. Billy has one. And so does Sam."
"But son, will you actually play with it?"
"Umm, who said anything about playing with it, daddy? I want one because the cool kids have 'em."
"You aren't going to play with it if we sacrifice and maybe dip into your college fund to buy it, are you?"
"Daddy! Of course I will. But what's really important is that I can brag to Jimmy and Joe that I'm just like Billy and Sam."
"Son, I think that's good enough for me. You're getting a Hot Wheels set for Christmas."