A selection of carols for your dysfunctional friends:

SCHIZOPHRENIA:
 Do you Hear What I Hear?

MULTIPLE PERSONALITY  DISORDER:
We Three Queens Disoriented Are, So Am I

DEMENTIA:
I Think I'll Be Home for, uh, Easter?

NARCISSISTIC:
Hark the Herald Angels Sing About Me

MANIC:
Deck the Halls and Walls and House and Lawn and Streets and
 Stores and Office and Town and Cars and Busses and Trucks and
Trees and Fire Hydrants and do it really fast...

PARANOID:
 Santa Claus is Coming to Get Me.

PERSONALITY  DISORDER:
You Better Watch Out, I'm Gonna Cry, I'm Gonna Pout, Maybe I'll tell
you Why.

DEPRESSION:
ĘSilent Anhedonia, Holy Anhedonia, All is Flat, All is Lonely, I Don't
Care.

OBSESSIVE-COMPULSIVE DISORDER:
 Jingle Bell, Jingle Bell, Jingle Bell Rock,
 Jingle Bell, Jingle Bell, Jingle Bell Rock,
 Jingle Bell, Jingle Bell, Jingle Bell Rock,
 Jingle Bell, Jingle Bell, Jingle Bell Rock,
 Jingle Bell, Jingle Bell, Jingle Bell Rock,
 Jingle Bell, Jingle Bell, Jingle Bell Rock,
 Jingle Bell, Jingle Bell, Jingle Bell Rock,...uh...,
....(better  start again)

PASSIVE-AGGRESSIVE PERSONALITY:
On the First Day of Christmas My True Love Has to Give to Me (and
now I want her to take it all way.)

 BORDERLINE PERSONALITY DISORDER:
Thoughts of Roasting on an Open Fire.