Holy egg, Batman!

Martin checked for eggs yesterday. He found one in the first nesting box. Then he checked the second one and said, "Oh! There are two in here."

It is super exciting every time a new chicken lays an egg. So, I rushed over to look in. This is the third egg... What?!?

I am wondering if one of my other variety started laying. The other eggs have come from two of my Black Stars. Maybe this is from a Buff.  But no matter who laid it, that is a HUGE egg for a first egg. 

Here is a comparison to a store bought white large egg. Crazy!