When we were still homeschooling we did a hatching project. Unfortunately, the incubator that I borrowed from my brother in law was reliable (unbeknownst to us) we had a dozen fertile eggs and religiously did what we were suppose to do. We were almost to the end when the heater on the incubator spiked.
When hatching day came, nothing happened. We decided to give it another day or two "just in case" Well, my husband decided it was time to call it (he was raised on a chicken farm) he took the eggs out and broke them open. Sadly, they all contained fully formed and feathered chicks. They died with the temp. spike. We were all disappointed. Probably none more than my son. We went out that afternoon and got 2 hens and a rooster (teenagers as we called them :P) We named them Laverne, Shirley and Fonzie. Laverne was the last one living and sadly she just passed away this week.