[s6e13] The Horny Unicorn -

Heavily implying the end of his hard-earned sobriety, BoJack takes a drink of beer handed to him at the party.

Standing outside a college frat party, BoJack finally opens and reads the letter. [S6E13] The Horny Unicorn

The emotional crux of the episode involves a physical letter BoJack receives from his half-sister, Hollyhock. Heavily implying the end of his hard-earned sobriety,