Lunch time

I have just eaten breakfast, and am sitting in my little glass box working on a survey on the complexity of CSP. My mother-in-law comes in and asks:

MIL: Would you like to eat?
Me: No thank-you. I'll eat later.
MIL: Why?
Me: I've just eaten. I'm not hungry.
MIL: So why don't you eat?
Me: Because I'm not hungry. I've just eaten.
MIL: Would you like to eat later then?
Me: Sure.