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1) Light bulbs will burn out at twice the normal rate, and primarily in difficult-to-reach locations.
2) Garbage day doesn't come soon enough
3) When purchasing libations, figure roughly three drinks per guest-- or double that if they have a two-year-old
4) Have each guest bring an empty box with a return shipping label -- something WILL be forgotten.
5) And finally, don't forget: batteries are the currency of Christmas morning