LOL, my ex and I used to do that too--we'd smirk at each other and say, "gee, we'll never have to worry about that...."
And of course, there are plenty of times when I go past the "baby aisle" (i.e diapers, formula, etc.) at the grocery store and think, "HAHAHAHAHA I'll never have to go down that aisle!!" (In reality I do because sometimes they also put the no-baby stuff--i.e. pads and such--down that aisle, but still...)