[wow at this point he doesn't know if the idea is hilarious or if he's getting vaguely annoyed HDU SON i have my dignity!!1 either way, have some faked cheer theatrics and acidic sarcasm]
Merry Christmas, kids! Forget your happy, adorable Santa. This year, Santa's going to be a small, dangerous man who's likely to burn you alive if you cross him.
[then, dryly:]
Might be more effective in deterring them from finding their way to the naughty list.