[ Hisanta Hajime is coming to town (or well, he already is in town) and is going to find out where you live and HUNT YOU DOWN

or something like that he's knocking on the door and ringing the doorbell and what Naegi will hear is the voice of a rather old man (Santa??) saying: ]

Ho, ho, ho! Naegi Makoto, I have come to give you your Christmas gift! Usually I would do this while you were sleeping, but since you've been a good boy this year, I decided to come visit in person! [ HINATA PLEASE ]