In Pusha T's new Arby's sponsored McDonald's diss, Push makes reference to a JAY-Z lyric from Hov's Blueprint track 'U Don't Know."

 “Look, I could sell water to a whale," Push raps.

That confused some folks, who believed JAY's bar was "I'll sell water to a well."

Just Blaze, who produced 'U Don't Know," got to the bottom of it all by asking Hov himself.

"Haaa!!! Well/whale.  It's never a coincidence when these things happened," Jay typed.  "I try to make things work on multiple levels every time I sit down to create.  It keeps my engaged."

So there you go.