Christmas is a time for family members to reunite around the fireplace.
Or to stoke the flames of sibling rivalry at work.
How well do they get along?

Credit: Glen Wilson
Well,this clip from the movieshould help answer the question.
Right here, we give you a preview of the Aniston-Miller rivalry.
ENTERTAINMENT WEEKLY: T.J., you drool on Jen and wrestle with her.

To read more on Office Christmas Party, pick up the new issue of Entertainment Weekly on stands Friday, or buy it here now – and subscribe for more exclusive interviews and photos, only in EW.ERIC RAY DAVIDSON for EW
How quickly did that sibling chemistry form?
And what does it feel like to be inside of an Aniston headlock?
MILLER:Its the softest, sweetest headlock a person being wrestled could ever hope to be in.
ANISTON:Thats a disappointment.
MILLER:When she slaps you, though, you know that she means it.
MILLER:We had brother-sister chemistry.
[Aniston laughs.]
I heard that you were very sweet, but I thought, How do we establish this chemistry?
Aniston also remembers meeting Miller at an awards show.
She describes it as very friendly and more than a little… wet.
ANISTON:I was a fan fromSilicon Valley, so I knew of him.
MILLER:Wait til you see this year.
ANISTON:It was incredible.
I think we already knew we were doing it at that point.
You came by after you had done this very committed bit on stage.
[to EW] It was one of those Hey!
Hes quite a shvitzer.
MILLER:Well, I was carrying a four-person puppet rig.
ANISTON:But I felt like we knew each other.
In that one little moment I felt like, Hes the sweetest guy.