Want a day off

Smith goes to see his supervisor in the front office.
"Boss," he says, "we"re doing some heavy house-cleaning at home tomorrow, and my wife needs me to help with the attic and the garage, moving and hauling stuff."
"We"re short-handed, Smith" the boss replies.
"I can"t give you the day off."
"Thanks, boss," says Smith "I knew I could count on you!"