You know how people say, "The show starts out slow, but if you can just get through a few episodes, you'll be addicted"? Well, Netflix did a study to find out how many episodes it takes to get people hooked on various shows.

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It's kind of complicated, but basically they know people stop watching if they can't get into a show. They looked for the episode that resulted in the least amount of drop-off. The episode that "hooks" people is the one that inspires at least 70% of viewers to complete the first season and potentially go on to additional seasons.

For example, "Scandal" had viewers locked in by episode two, but it took right episodes of "How I Met Your Mother" for people to get to the point where there's no turning back.

Here are 25 shows and the episode that "hooked" people.

Episode Two: "The Walking Dead", "Breaking Bad", "Sons of Anarchy", "Scandal", "Bates Motel", "The Killing", and "Suits".
Episode Three: "Dexter", "Orange Is the New Black", "House of Cards", "Marco Polo", "Gossip Girl", and "Sense8".
Episode Four: "Better Call Saul", "Pretty Little Liars", "Bloodline", "Grace & Frankie", and "Unbreakable Kimmy Schmidt".
Episode Five: "Daredevil" and "BoJack Horseman".
Episode Six: "Mad Men", "Once Upon a Time", and "The Blacklist".
Episode Eight: "Arrow" and "How I Met Your Mother".