What really irritates me is if a date is given for it's delivery, it gets close, like in the same state or some towns/counties away... Then it goes away - as into another state, or even close to where it originally came from! Moving the delivery date further ahead on the calendar.
I had a shipment come from Ohio, it got to somewhere in the SW region of my state. Then it went back to Ohio... even as far as Florida (wtf!?)... I eventually got the package, but it was (iirc) 2 weeks after the initial estimated shipping date.
ETA: Oh wait! I recall now. First it was being delivered by FedEx, then it changed hands to the USPS. It was after that that it started going on it's epic journey.