Christmas snuck up on my this year- literally! Just last week it was summer 1988. Then the next day it was December 2008! I had like no time to prepare. Dangerous stuff, time-travel is.
But anyway, Santa's a good guy. You know how there's an exception to every rule? He's the exception to the "defend yourself from dude breaking into your house" rule. Except I guess there really are people who dress up as Santa and break into houses and steal stuff? So maybe you should defend yourself anyway just to be safe...