儿7岁。

Son： Cotton ball for one thousand dollars!
Me: Too expensive. That won't sell.
Son: Mom for one dollar!
Me: Okay, let me call some kids I'm sure many of them would like to have me for one dollar. 
:
:
Son: Mom, I want ...
Me: Sorry, I'm not your mom anymore. You sold me.
Son: Okay, Mom, you are for one thousand dollars!
Me: Too cheap!
Son: One million dollars!
Me: Still cheap.
Son: A million?  That's a lot of money!
Me: Yeah, but still cheap for a mom.
Son: Alright, no one can have that much money. A billion!
Me: That is a lot of money, but some people do have that much money.
Son: Yeah, but who would pay a billion for a mom?
Me: $%&#*???!!!