Where do eggs come from anyhoo?

During one of many 'phone calls to my mother today, she went off on a sudden tangent about eggs, of all things, in amongst our expressions of concern about this, that and the other. 'Oh,' she said, 'well ... eggs ... they don't come out of their bottoms, or do they? Och, anyway, you know I'm just far too busy to worry about the fact that I know nothing about the anatomy of a chicken.'

And that, I reckon, just there, is the source of how I came to be how I am.