Bad Santa (2003) (UNRATED)

Genre: Comedy | Crime | Drama
Starring: Billy Bob Thornton, Bernie Mac, Lauren Graham, and John Ritter
Tagline: He's very naughty . . . and not very nice.

Plot:
A miserable conman and his partner pose as Santa and his Little Helper to rob department stores on Christmas Eve. But they run into problems when the conman befriends a troubled kid, and the security boss discovers the plot.

http://www.imdb.com/title/tt0307987/
http://en.wikipedia.org/wiki/Bad_Santa