The Shawcross is the entity that eats your food out of the fridge or biscuit cupboard. Some believe he exists only in legend, however equally others say that they knew they had half a fruit cake in the cupboard which has now mysteriously disappeared.
In some cultures, The Shawcross is also blamed for the loss of one sock out of a pair - especially when you know you DEFINITELY put two in the washing machine.
John "WTF ! I had half a Christmas cake in the bread tin which I've been looking forward to all day... Have YOU eaten it Tim you fucker??"
Tim "No - maybe we've been visited by legendary food thief... The Shawcross!!!"