Hatching a double yolker?

[PinkFlamingoFrm]

Has anyone successfully hatched a double yolk egg?
Out of curiosity, I put on in the incubator, I didnt really expect anything, but its starting to form. Will the egg actually hatch?

 

[Granny Hatchet]

on u tube there is a video of twins hatching. i tried it once and as one chick developed it ended up peircing the yolk of the other and drown but you should watch the video, its pretty cool