Which TV series had the most unforgettable season finale?

I was binge-watching some old TV shows recently and hit a season finale that just blew my mind—no spoilers, but it was from *Breaking Bad*. That last episode of the season wrapped things up so perfectly yet left me craving more. It got me thinking about other shows with killer season finales that stuck with us long after the credits rolled. Like, remember the *Game of Thrones* Season 6 finale? So many jaw-dropping moments. Or the *Stranger Things* Season 1 ending with that eerie cliffhanger? Those finales really shape how we remember the entire season. What about you? Which season finale had you talking about it for days? Any under-the-radar shows with endings that surprised you? Would love to hear your picks!