bccs, you may have something there. I used to watch my grad school advisor's kids. I'd challenge them to race each other to some distance and back. when they'd return, I wouldn't declare a winner. I'd just say I was sure they could go faster than that.... they'd fall for this many times over, and I was assured they'd be tuckered out after dinner.
So, this may be Princess' attempt to say "oh, I'm sure you can eat some more".... but those crops are HUGE!