Why is it...?

Why is it that:

when you finish doing the dishes you find some more "hiding" in another room?
after you vacuum your kids wants to eat breakfast while watching cartoons and spill it everywhere?
after you clean the toilet someone is GOING to pee on the seat?
during nap time someone drives by with a loud car/truck/sound system to wake the kids?
right after you draw with chalk the rain washes it away?
you struggle to get downstairs and out the front door with your kids and realize you forgot the whole reason for the trip on the table?
when you really want to be outside on a nice day the kids are terrible and don't deserve a trip to the park?
the meal you eat after you mop the kitchen floor gets thrown by your toddler?
when you have dinner ready your husband comes home late from work?
When you have extra money something breaks?