In certain situations, I find this phrase hilarious. Especially the first one I heard it in:
Sister In Law: If you let your baby sleep on its stomach, it tends to die. In the medical profession, this is called Sub Optimal Baby Raising. Pretty much any child-rearing style that results in the death of said child is sub optimal.
I would laugh a lot more, if she didn't need to explain this to people in the ER all the time.