Monsters, Inc.
Disney gave me a free digital copy of this when I redeemed my Ultron code for some reason. I didn't even pick it, they just somehow knew that this was my favorite animated movie ever.
So, thanks Disney.
Also, the fact that Steve Buscemi screams "I will personally put you in the shredder!" and that's just a big Fargo reference, is one of the best hidden, adult, inside jokes in a kid's movie.