if you turn the egg and the bubble follows you to the top of the egg no matter what direction you turn it. (like water in a balloon) then yes the eggs are bad. It is good to get rid of the eggs with the bubble and focus on the good ones. Its a mystery but I am not sure why that happens to eggs. I believe it is the due to the rough handeling of the postal system. Or it could be because the hens whom laid the eggs were really young.