Elf Inspection!

Wasgij Christmas 17: Christmas is just around the corner and the residents of the North Pole are busy preparing for the most magical night of the year. But when Santa and Mrs Claus pay a visit to the elves’ workshop, no one can believe their eyes at the scene they find inside. Something has left them shocked, and it looks like the naughty list is about to get an awful lot bigger!

What could have caught the eye of Santa’s reindeer just as they were about to warm up with a hot drink? That is the image you need to puzzle.