The folks over at Gearbox sure love their easter eggs and hidden secrets. Borderlands 2 is chock full of them.

But while playing the first campaign add-on to Borderlands 2, called Captain Scarlett and Her Pirate's Booty, I stumbled on what might have to be known as my favorite.

Easter egg spoilers follow

Because it's a reference to BioShock, and I absolutely squeed when I saw Big Daddy come through mid-battle. I hadn't noticed his midget companion, named Lil Sis, but fortunately SquishyMoobs did in the video above.