3 titles.

1. The Big Bang Theory (2007 TV Series)
Episode: The Rhinitis Revelation (2011)
Thanks, but I watch the 'Charlie Brown Christmas Special' every year, so I get the gist.
2. Buffy the Vampire Slayer (1997 TV Series)
Episode: Passion (1998)
Ira Rosenberg's only daughter nailing crucifixes to her bedroom wall? I have to go over to Xander's house just to watch A Charlie Brown Christmas every year.
3. Joan of Arcadia (2003 TV Series)
The Charlie Brown Christmas tree of metaphors?
3 titles.