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Parodied: Mary is actually cast as Mary in a Nativity play as a little joke because she's pregnant. She ends up actually giving birth in the middle of the play.
Zig Zagged: ???
Although pregnant, Mary doesn't give birth or show any signs of giving birth during the Christmas period.
Mary's pregnancy doesn't coincide with the Christmas season, or if it does it's in too early a stage for her to give birth.
Enforced: The writers have had a Christmas Episode commissioned and have decided to do an old standard for the season in lieu of anything else.
Lampshaded: Mary, an atheist, exasperatedly points out how irritating it is to fall into labour in the exact same circumstances as the Nativity.
Mary belongs to a fundamentalist Christian sect which believes that the child she is carrying is the messiah, and have induced Mary's labour at Christmas for the symbolic value.
The child Mary is carrying actually is the Second Coming; it turns out his father likes the symbolism...
Defied: Mary makes a point of avoiding anything even a little bit religious themed over the Christmas period in order to avoid having her pregnancy associated with it.
Discussed: "I swear, if any pregnant ladies called Mary or wise men following a star looking for a pregnant lady called Mary turn up this year, I'm cancelling Christmas."
Conversed: Wow, they're laying on the symbolism a bit thick in this episode, aren't they?" It's Christmas — what do you expect?"
The story actively points out that December 24th-25th is just a date like any other, and that lots of pregnant women happen give birth on that date, and there's nothing special about it; it's just centuries of Judeo-Christian tradition putting meaning where there is none.
And that if historical research is to be believed, it wasn't in all likelihood or actuality the birthdate of Jesus anyway.
Reconstructed: The story points out that the above is true... but that Mary's case is a little more special than these others...
Played For Laughs: Circumstances surrounding Mary's labour are contrived to look as much like the Nativity as possible; three 'wise men' bearing gifts appear, the place is filled with stable animals for some bizarre reason (and the story is set in an urban which would not normally have stable animals nearby anyway), a 'star' appears in the sky right above where Mary is giving birth and even a couple of shepherds (on their way to the Annual Shepherds And Livestock Keepers Christmas Party) turn up. This does not escape the notice of the characters, who lampshade it with increasing bewilderment.
Played For Drama: Joe, an embittered Straw Atheist, finds himself helping Mary, a poor homeless woman expecting a child at Christmas, through circumstances which share similarity to the Nativity story. The experience helps him rediscover his faith or at least ease his demons.