Spoilers ahead if you haven’t seen Lost yet. I didn’t start keeping track until season 2, so there’s nothing for the first season, and I may have missed some WTFs in the last two seasons.

Season 2

  • Orientation (2.3): Ana Lucia gets pulled out of the pit by the Others (“What the hell!”)
  • The Other 48 Days (2.7): Goodwin kills Nathan (“What the hell!”)
  • The Hunting Party (2.11): Mr. Friendly meets Jack, Sawyer, and Locke in the jungle (“W. T. F.”)
  • Dave (2.18): Libby is at Santa Rosa (“Oh snap!”)
  • Two for the Road (2.20): Michael opens Henry’s cell and shoots himself (“What the fuck!” (right after saying “Thank you!” and “Why did you do that?”))
  • Live Together, Die Alone (2.23): Desmond says, “I think I crashed your plane.” (“Hmm.”)

Season 3

  • Flashes Before Your Eyes (3.8): Eloise tells Desmond, “Give me that sodding ring.” (“W. T. F. Who is this lady?”)
  • Expose (3.14): Nikki stumbles out the jungle and dies (“What the hell was the point of her?”)
  • Left Behind (3.15): Kate and Juliet are handcuffed together (“Oh snap.”)
  • One Of Us (3.16): Ben talks to Juliet about pregnant women: “There may even be one on that plane.” (“Oh snap.”)
  • D.O.C. (3.18): Naomi tells the survivors about Oceanic 815: “They found the plane.” (“Waaaat.” and “What the fuck?”)
  • The Man Behind the Curtain (3.20): Ben tells Locke after visiting the Cabin, “That was Jacob.” (“O. M. effing. G.”)
  • The Man Behind the Curtain (3.20): Ben returns to Dharmaville after the Purge (“WTF!”)
  • The Man Behind the Curtain (3.20): The Hostiles emerge after the Purge (“Yeah, what the fuck is going on.”)
  • The Man Behind the Curtain (3.20): Ben shoots Locke in the Dharma grave (“What the hell! Fucking Ben!”)
  • Through the Looking Glass (3.22): Flashforward (“The hell? … This. makes. no. sense.”)

Season 4

  • The Beginning of the End (4.1): Hurley says, “I’m one of the Oceanic Six!” (“The hell?”)
  • The Beginning of the End (4.1): Abaddon shows up at Santa Rosa (“The hell?”)
  • The Beginning of the End (4.1): Hurley sees an eye at Jacob’s cabin (“The hell?”)
  • The Beginning of the End (4.1): Hurley runs away from the Cabin, and it appears in front of him (“WTF.”)
  • The Beginning of the End (4.1): Charlie shows up at Santa Rosa (“The hell?” and “I’m really confused.”)
  • The Beginning of the End (4.1): Daniel lands on the island (“The hell?”) (only because he thought he was Charlie)
  • Confirmed Dead (4.2): Locke says, “I’d probably be dead if I still had a kidney.” (“Oh snap.”)
  • Confirmed Dead (4.2): Ben shoots Charlotte (“The hell?”)
  • The Economist (4.3): Sayid shoots Peter Avellino (“Huh? Wh-What?”)
  • The Economist (4.3): Sayid is working for Ben (“The hell?”)
  • Eggtown (4.4): Kate’s lawyer calls Jack to the stand (“O.M.G.”)
  • Eggtown (4.4): Kate says, “Hi, Aaron” (“Ooh.”)
  • The Constant (4.5): Desmond’s nose starts bleeding (“Oh shit.”)
  • Ji Yeon (4.7): Sayid and Desmond meet Kevin Johnson (“Ohh!”)
  • Ji Yeon (4.7): Jin says, “We’ve only been married two months.” (“Whaaat… I’m confused!”)
  • Ji Yeon (4.7): Sun and Hurley go to visit Jin (“What the hell…! That sucks!”)
  • The Shape of Things to Come (4.9): Rousseau is shot (“Oh shit.”)
  • The Shape of Things to Come (4.9): Alex is shot (“What a douche!”)
  • Cabin Fever (5.11): Claire is in the cabin (“The hell?”)
  • There’s No Place Like Home (4.12): Sun controls her father’s company now (“Oh snap!”)
  • There’s No Place Like Home (4.12): The numbers are on the speedometer in Hurley’s Camaro (“Oh shit.”)

Season 5

  • This Place Is Death (5.5): Christian meets Locke in the well (“O.M.G.”)
  • The Life and Death of Jeremy Bentham (5.7): The man who wasn’t on the plane says, “My name is John Locke” (“W.T. fucking. F!”)
  • The Life and Death of Jeremy Bentham (5.7): Abaddon is in Tunisia (“OMG”)
  • The Life and Death of Jeremy Bentham (5.7): Ben strangles Locke (“The hell!” and at the end of the scene, “That was… somethin’.”)
  • 5.11-5.17 ?

Season 6

  • LA X (6.1): Sideways: Desmond is on the plane (“What’s he doing there?! What the hell! He’s not supposed to be on the plane!”)
  • LA X (6.2): Sayid comes back to life (“OMG”)
  • What Kate Does (6.3): Sideways: Ethan meets Claire in the hospital (*gasp*)
  • The Substitute (6.4): Sideways: Ben’s a teacher (“What the hell!”)
  • The Substitute (6.4): Sideways: Jack meets David (“The… heck? Who is he?”)
  • Everybody Loves Hugo (6.12): Locke throws Desmond down the well (“What the hell?”)