What's the cream pitcher doing above the door?

Yesterday, lunching with a friend at the Little White House in Ft Langley, I looked out the window and saw this tiny cream pitcher poised above the door. What can it mean?
  a. The jug is catching a very slow drip.
  b. A valuable antique is hidden in plain sight.
  c. A very small child playing a very small joke has arranged for a spill when the door opens.
  d. Mice ordered a keg of ale for a sill party.

No, wait. A faithful reader has just provided the answer. Elves collecting liquid silver.