Card Wars — [s4e14]

Despite being a novice, Finn begins to excel, much to Jake’s growing frustration.

Seeing Jake’s genuine emotional distress after losing, Finn chooses to intentionally lose his "Cool Guy" status to preserve their friendship. He realizes that winning a game isn't worth making his best friend feel like a "dweeb".

In the Adventure Time episode , BMO warns Finn not to play a card game with Jake because he is a "sore loser." Naturally, Finn ignores the warning, leading to a high-stakes, hyper-competitive battle for the title of "Cool Guy." The Setup: More Than Just a Game