The Gimmies

I took the kids to Toys R Us to try to get Halloween costumes for next year on clearance (no such luck) and discovered that Nathan's getting a bad case of the "Gimmies." I'm trying to explain that he has to ask Santa for these things, but he wants them and he wants them NOW. He isn't throwing fits, but he is saying, "But can I take it home today?" a thousand times in a row. He'll even look through the ads and tell me what he wants. I told him he can have FEW toys for Christmas, but we can't have everything =)