Expectation: The piece of furniture you ordered and scheduled for delivery on Monday, will be delivered on Monday.

Reality: You'll get a call from the delivery people saying they'll deliver on Monday.  Then they call you back and say, um they're not sure, but they'll get back to you.  Then they call back and say they absolutely will deliver on Monday.  They promise, pinky swear.  Then another call.  Oops, their mistake... they're not delivering on Monday after all... you're totally cool with changing all of your plans, right?