Bill gives it a moment’s thought and says: “Sure!   Why not.  Where’s the vacuum ?" 

Half an hour later, Bill comes into the kitchen to get some coffee.  His wife says, “I didn't hear the vacuum running:  I thought you were going to do the vacuuming ?”  Exasperated, Bill answers, ”The stupid thing is broken: it won't start.  We need to buy a new one.

”Really ?” she says, “show me -- it worked fine the last time.”