Holy Dejah Thoris, Batman!
Humans sometimes do lay eggs, and the infant hatches out of it. We call it “being born with a caul”. The egg spends mere seconds intact before the infant hatches, but in a literal sense it’s still an egg.
Would it be “ouch” two separate eggs for fraternal twins?
and
Double yokers for identical twins?
Or did happen, which is why that particular mutation didn’t become dominant.
How wold the kid get out? Would we have some infant egg-opening spike that we later lost as we aged?
The saying “Don’t put all your eggs in one basket” would have an entirely different meaning.
I have a dumb question: What do platypus eggs look like and how come we don’t eat them? Is it just that they’re more rare and/or harder to get than bird eggs?
Without the dreams, we’d never have had Jesus 
Those long evenings suffering while you go through your neighbour’s family albumin would still be murder.
Mr Google is your friend - not only are they smaller than a thumbnail, the platypus is a protected species.
Those were, without exception, always our motivations in West Texas.
Or the egg would start rocking from the infant’s struggles, and a nearby adult would crack it with a rock.
That could be a difference between humans and apes in the Eggverse; apes would have some sort of natural claw or spike to get out of the eggs, while humans would lack it and use tools instead.
There might be a prejudice based on the colour or texture of one’s eggs.
“I can’t prove it, but I swear Clarissa paints her eggs !”
Pysanky would be a lot different, that’s for sure. And the Easter Bunny would be the most important religious figure.
There’s something close, called a “balut.” It’s a fertilized duck (or chicken) egg with a nearly-developed embryo inside that is boiled and eaten in the shell.
Just check out the pictures on the Wiki page, especially the third one down.
Supermoms would spend big bucks on having their eggs professionally painted, buy headphones for the eggs, maybe cute little egg cozies…
Child: “Mummy (or Mommy), my egg’s bad…”
Mom: “Hush now and eat it up.”
<pause>
Child: “Mummy (or Mommy), my egg’s really bad!..”
Mom: “Just eat it up!”
<long pause>
Child: “Mummy (or Mommy), must I eat the beak too?”
Easter would be a blast for the moms to decorate their kids. Contests and prizes for the best decorated kids.
I think I might have just been whooshed, but I will forge ahead anyway – this is incorrect. Being born with a caul refers to babies that are born with the bag of waters still intact. It happens, but rarely. The bag of waters is not an egg; it is the sac that holds the amniotic fluid while the fetus is in utero. Usually it breaks sometime during the process of labor and delivery, but not always.