One of my favorite exchanges in any film, anywhere.
[Willie is at work as a Mall Santa. The kid on his lap stares blankly at him.]
WILLIE
Marcus, get this kid off me before he pisses on me, all right?
[The kid reaches up and pulls on Willie's beard.]
What the fuck are you doing? Don't fuck with my beard.
KID
It's not real.
WILLIE
No shit. Ya see, it was real, but then Santa got sick and all the hair fell out, so I have to wear this fucking thing
KID
How did you get sick?
WILLIE
I loved a woman who wasn't clean.
KID
Mrs. Santa?
WILLIE
No, it was her sister.
--Bad Santa, 2003, by Glenn Ficarra & John Requa
All hail the great lord Santa!