Double yolk or what the heck is in my egg?

[misserink]

A neighbor gave me some eggs to incubate and one was twice the size as the others. I decided to candle it to see if there were two yolks, but what I saw was a bunch of little things and one big thing floating around. What on earth could it be? Displaced air sac?
I took a video, but my camera doesn't show all the detail. Anyone seen this before?

 

[blucoondawg]

Hard to say for sure but I'd say it's probably just double yolk if the eggs are fresh they won't have much of a air pocket in them yet. Any huge egg I've ever had has been double yolk I generally don't try incubating them just because they're harder to get through to hatch than a average egg