While putting kyle to bed tonight...
Me: Kyle, now you might hear some banging sounds downstairs tonight. Whatever you do, don't come downstairs. If Santa sees that you are awake, he'll run away and take all the presents with him.
Kyle: I might come out real quick to go in your room or something.
Me: If you do, you might ruin Christmas for everybody.
Kyle: Everybody in the whole world?!?
Me: No. Just ruin it for you and your sister.
Kyle: [super releived] Phew. Oh, okay.