Santa.

Santa Claus: the legendary patron saint of children; an imaginary being who is thought to bring presents to children at Christmas. 

Here's the story:

Breaking into the local mall's Santa display concludes in: dog is in fact a robot, the chair is incredibly comfortable and the escape results in weeks recovery of an agonizing twisted ankle and a very blurry photo. 

January 2013.

Reference:

"WordNet Search - 3.1." WordNet Search - 3.1. N.p., n.d. Web. 15 Feb. 2014. <http://wordnetweb.princeton.edu/perl/webwn?s=santa%20claus>.