Getting In The Christmas Spirit

OUR SCENE: A family, gathered 'round the fresh-cut Christmas tree. Boxes of ornaments open and strewn about as every Christmas. The oldest daughter has just unwrapped another knick knack from the boxes.

MOTHER: Oooh, what's that?
DAUGHTER: Good question. If I had to say offhand, I think I'd classify it as a reindeer with one hell of a thyroid problem.
MOTHER: [Nearly chokes on Christmas cookie.]