For the love of mobile storage
Pack a lunch. It is too easy to spend moving day scrounging for something remotely foodlike in convenience stores and fast food drive throughs. By the end of the day, everyone is overcaffeinated, full of starch and grease, and cranky. To prevent that, spend the night before packing ready to go meals that do not need reheating. Even something as simple as a ham sandwich and a pudding cup can make an incredible difference in your and your moving companion's moods.