Silly bickering
It's amazing sometimes what you get to fight about; things you never thought possible suddenly come true. For example, we now have arguments over which one gets to take the "good" car for various errands. The "good" car is the leased/rental car we got for getting around to clients and other things. The "other" car is less worthy in many respects which leads to annoying bickering over who gets to take what to where. God. You'd think the world has enough *serious* problems to deal with already, wouldn't you?