OK, I’m really bored so I did some searching.
According to an AOL chat log of, get this, the “Cake Decorating Chat Hour” featuring screen names like “Pwd Sugar” and “CakeStmper”, you treat the double yolked egg as if it were one egg and will probably get a “richer cake”
As far as chickens from double-yolk eggs, the embyros and the baby chicks are apparently bigger, but the effects eventually disappear later in life. Double yolked eggs do hatch only one chick though, as far as I can tell from this abstract.
According to this [egg"]http://www.enc-online.org/trivia.htm]egg]( [url="http://www.enc-online.org/trivia.htm) trivia site (yeah, I’m bored today), the largest single chicken egg ever laid weighed a pound with a double yolk and double shell.
Some folklore suggests that an egg with a double-yolk was said to indicate an imminent death in the family.
Finally, it is possible to deliberately collect a dozen double-yolked eggs. Go to the bottom of this page for more info.
Great. Now I’m bored and hungry.
Back off, man. I’m a scientist.