stocking from santa.
But I remember as as child I wanted to test that theory, so I went to the attic, and found my stocking, and I hung it up next to my bed. I wanted to find out if Santa would be prompted to come fill my stocking ANY time I put it out, even in July (I was an inquisitive child, I even persuaded my dad to let me try skiing on the lawn in July, there was a small slope of grass).
The next morning I could see the stocking BULGE.
There was a Potato in there.
Courtesy of mum, I think.