Merry Christmas from St Auckland in the City, New Zealand...
It's meant to say something about the Virgin Birth. The suggestion here is he wasn't as good at it as was God on the first occasion. She might be wondering what she is going to tell Liz this time. I think he looks quite sad and she thinks he's not up to the job, but on the other hand he did father quite a few more with her so perhaps they were a bit happier than suggested here.
By the way, I've doubled the size of the original web image (it is a poster outside the church) and made it a bit more arty. So click on the picture for yet more fun.
Ah well. The latest is that continued attacks by knife-wielding Christians have forced the poster off the streets.