Don't ever do anything fun with the kids again.
They are just too tired and crabby the next day, and I find myself lacking the energy to deal with all of the whining, crying, fighting and nonsense.
Keep them locked in their dark rooms so that they won't expect anything and so that you don't have to hear them.
It's 10am and I'm about to swaddle them both up like newborns and leave them on the doorstep of the firehouse and run like hell. If only Big Kid would forget our phone number...