I give you 'Jug of Wine'.
This item we could never drink in game. However, this item caused many of us grief during the Lich King days I'm sure...at least I know it did for me.
You see, this item was needed for one of the Dalaran Cooking Dailies. It could only be found in the 'One More Glass' building. Which means this item was heavily camped on the days this was needed for the daily.
Thankfully, I don't need to go looking for this jug anymore.