I went to a family friend's house to pick up some eggs to test my bator with. While we were talking, one of her hens sat beside me and laid a rubber egg. So my friend says why don't you take that one as well, not realizing it was a rubber egg as I picked it up. So as I did pick it up, I said, "oh, it's a rubber egg." She replies with "they are all soft like that at first, that's why they are so easy to lay"
This woman has been raising chickens for 20 years....