Toddler demands

So my oldest boy until recently was a lovely sweet child. He has hit two now and things have changed.
Now I've read all these baby psychology books (mostly written by childless folk) so I know how his little mind has grown and what he's thinking.
He knows that to get things you have to ask. He hasn't quite grasped how the word NO works though.
No stirs up a hidden monster and the aftermath is not pleasant!
When you go out for a nice family meal and your toddler only wants to eat corn you find that kid corn and pile it on his plate. You never know you may even get to finish your food before it gets cold!