In my opinion, best of the season and best of the show (yet).
First of all, I'd like to say that Uzo Aduba is one of the most talented actresses on TV. She plays a complicated character that, even though being childlike and funny, doesn't feel like a caricatured version of a special person/person with a mental illness. It feels true instead.
This episode gives us the backstory on Suzanne a.k.a Crazy Eyes, and shows how her innocence and mental condition ended up making her a criminal. It makes us feel sorry about her without being cheesy, even though we know what she did was wrong.
It also showcases situations where debating the punishment concept feels necessary. Are guards monsters for making inmates fight between themselves and betting on it although the inmates aren't doing anything wrong? Or are they just doing their job, since the inmates are criminals and they're in prison for punishment?