The Big Bang Theory2007

Penny:
Hey Sheldon, are you and Leonard putting up a Christmas tress?

Sheldon Cooper:
No, because we don't celebrate the ancient pagan festival of Saturnalia.

Penny:
Saturnalia?

Howard Wolowitz:
Gather round, kids, it's time for Sheldon's beloved Christmas special.

Sheldon Cooper:
In the pre-Christian era, as the winter solstice approached and the plants died, pagans brought evergreen boughs into their homes as an act of sympathetic magic, intended to guard the life essences of the plants until spring. This custom was later appropriated by Northern Europeans and eventually it becomes the so-called Christmas tree.

Howard Wolowitz:
And that, Charlie Brown, is what boredom is all about.