yolk yolk

so this morning i was making my normal breakfast of egg whites, and i cracked open a double-yolked egg. i incorrectly assumed that this would produce a set of twin chickens, as i think most would. i did a little reasearch and found this information at http://www.healthdiaries.com/eatthis/double-yolked-eggs-are-two-yolks-better-than-one.html

Double Yolkers appear when ovulation occurs too rapidly, or when one yolk somehow gets "lost" and is joined by the next yolk. Double yolkers may be by a pullet whose productive cycle is not yet well synchronized. They're occasionally laid by a heavy-breed hen, often as an inherited trait.

About 1 in 1000 eggs has a double yolk so it isn't all that rare. In some countries, markets sell cartons of double yolked eggs.

Throughout history and in different cultures, finding a double yolk has been considered to mean anything from an impending wedding to a financial windfall to a death in the family.

So would a double yolked egg produce twins?

Probably not:
... the presence of the two yolks would generally lead to an unsuccessful hatch. The nutritional value of the egg white, which is an important food supply for the embryo is insufficient for the two embyros.

has anyone else ever found one of these? Just curious...

p.s. i'm hoping for the financial windfall.