I accidently opened the "Your Pregnancy..." email I get (and delete) every week. I don't mind seeing the subject line. "Oh, hey, I'm (however many) weeks," but I don't want to see the little cartoon fetus and read advice that doesn't really apply to me.
But I was just clicking up through my new mail and there it was. A little cartoon fetus at 21 weeks. I already know what a fetus looks like at 21 weeks. Well, a dead one, anyway. I imagine a live one looks pretty much the same. But, you know, alive.