Borderlands 2 came pre-mixed with ponies. Butt Stallion is a reference to the character of Rarity on the show- crystal unicorn horse with purple hair and tail. The Mechnomancer's skill tree is made up of references to My Little Pony quotes like "20% Cooler" and "Evil Enchantress"
Finally, the pony Fluttershy is actually thanked in the game's end credits.
I also borrowed it. And you know what? I liked it. So therefore I'm going to buy it when I am able, because it was a great game. If you don't like it because you don't have a sense of humor, don't buy it.
"(munching on pretzels) So, how’s your day been, buddy? We haven’t really talked much since I left you for dead. Hey, you think you’ll freeze to death out there? Nah, probably not. The bandits’ll get you first. (beat.) My day? It's been pretty good. I just bought a pony made of diamonds, because I’m rich. So, you know. That’s cool. (beat.) Kay, bye. I’m rackin' my brain trying to think of a name for that diamond pony I bought. I was gonna call it “piss-for-brains” in honor of you, but that just feels immature. Maybe...”Butt Stallion”? Nah, that’s even worse. I’ll give it some more thought. I should probably clarify -- the diamond horse I’ve been telling you about? It's not a sculpture, or anything. It's a living horse that actually happens to be made of -- actually, I'll just go get her. Butt Stallion! Say hello. (A horse whinnies.) Butt Stallion says hello."
Nice. Should have been Princess Luna, though. Wonder what would happen if Butt Stallion went to Ponyville, though. -cough-I'm suggesting something for a deviation now get to it-cough-oh Jesus I have a long cough-cough-
A horse with wings? I've been to places completely inaccessible from this plane of existence, and I have no reason to believe such a thing is possible. You've never actually seen anything like that, have you?