they go rotten
The silkworm will turn into a silkmoth, not a butterfly.
They give you chickens. White eggs give white chickens, brown eggs gives brown chickens and so on. Sometimes they turn into other gifts also such as a picnic set.
Your brains turn into fried eggs ofc.
I wonder if it happens with everybody. They sometimes turn brown when I wear them to, but I dunno why.
They turn brown and look nasty
Scrambled eggs can turn green when they are cooked at too high of a temperature or for too long. This happens when the iron in the eggs reacts with sulfur compounds, causing a chemical reaction that results in the green color.
Lice eggs will be a white or cream color if they are dead. If they are alive they are a brown or black color.
Around here it happens every summer.
They turn their eggs so they can be heated evenly on all sides.
If the geckos eggs have not been kept at the proper incubating temperatures they will usually start to turn to a different color and sometimes even dent inwards.
The Mute Swan is known to mate for life, they don't even care who will be their partner. The color of their eggs is blue-green when laid, turn white and then brown with staining.