Naughty.

Presumably to warn Marley and Rudy about their all-too-frequent lapses in good behavior, our Elf on the Shelf, Jingle, appeared one recent morning with a small bag of coal in her lap. 

Marley was nervous.  "I'm afraid for Christmas!" she wailed.  Which, I suppose, means that Jingle's message got through, momentarily.  I'm okay with that hiccup of fear, especially since it appeared to be gone by the time Marley was screaming at Rudy on the way to gymnastics this afternoon.