Ouch! Yes, it's an egg from one of our hens, and it is really large and really weird. When they first start laying, or re-commence laying after a molt, hens often produce "beginner eggs" like this one ... extra large, mis-shapen, with "wrinkles" or extra yolks. It's great fun for the young egg-collectors in this family to head out to the coop each morning and see whether there are any eggs, and check out whether there are any particularly weird ones. But I can only think about childbirth.