The Elf on the Shelf

My sister's kids have an Elf on the Shelf.  For those of you who are not well versed in Elves, the Elf on the Shelf shows up awhile before Christmas; an ambassador for Santa, if you will.  He keeps an eye on the girls and boys and reports directly back to Santa each day.  Every morning he is found in a different place in the house (because he needs to watch the kids from all around) and they have to find him.

Well, we're not sure what got into the Elf this year (maybe he ate some bad fairy dust), but he's turned quite mischievous.   No longer a quiet observer, he's taken Christmas into his own hands. So far he has

Held a snowball fight in the family room with the Grinch

 

Eaten my sister's Milano cookies (something no sane person would attempt)

Led all the animals on safari

 Ziplined across the living room (he saw pictures of Dorothy doing this on the Allure of the Seas and wanted to try it himself)

 

Used my sister for target practice  (really bad elf)

And done a little cross-dressing (an elf of questionable taste), stealing clothes from my niece's doll and make-up from my sister:

Fortunately, when he decided to go fishing it was only for pretzel gold-fish.

The elf needs an attitude adjustment, but there's not much time before Christmas.  I've suggested he be handcuffed and returned to Santa (express mail), but he's a wily one and hasn't yet been caught. 

Am thinking he needs a one way cruise to the North Pole.  Wonder what he'll do tonight?

Anybody have any ideas what to do with this reprobate?  I should think my sister would be afraid to go to sleep at night.  What could be worse than an elf gone over to the dark side?