SCHIZOPHRENIA: Do you hear what I hear?

MULTIPLE PERSONALITY DISORDER: We Three Kings Disoriented are

DEMENTIA: I think I'll be home for Christmas
 
NARCISSISTIC: Hark the Herald Angels sing about Me
 
MANIC: Deck the Halls and Walls and House and Streets and Stores and 
Office and Town and Cars and Busses and Trucks and Trees and Fire
Hydrants and . . . .
 
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

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, . . . (Better start over =
again)

PASSIVE - AGGRESSIVE PERSONALITY: On the First Day of Christmas, my
true love gave to me (and then took it all away)

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