[P.O.E.]

Forgot to mention: The Gino Giant pre-dated the Big Mac.

I always wondered if McD’s stole the idea from them.

[Harmless Teddy Bear]

No, they stole the idea from Big Boy.

Which was also probably where Gino stole theirs from too.

Big Boy is the original double decker hamburger although the place was called Bob's Pantry at the time and it was not yet a chain.