If humans laid eggs..

If humans laid eggs, mothers would go to a hospital delivery room and lay an egg. It would then be placed into an incubator for 9 months, after which the happy parents would come to witness the hatching of their child.

If humans laid eggs, cannibals would eat omelettes.

If humans laid eggs, egg-timers would need really long-lasting batteries.

If humans laid eggs, alchemy would be the art of "trying to lay a golden egg".

If humans laid eggs, "You gotta break a few eggs to make an omelette" would be a good pro-choice slogan.

If humans laid eggs, women wouldn't have evolved breasts.

...

I'm sorry, I can't go on.. I totally freaked myself out with that last one.