“Okay. This is called a tripwire. It's like...” – Hopper, Stranger Things ... TV Quotes Database

[In a flashback, as Hopper and El set up the defenses around the cabin]

Okay. This is called a tripwire. It's like an alarm. You, uh, set it up like this... and then, anybody gets close, it's gonna make a loud noise like, uh, gunfire. Bang. [Pause] Those bad men aren't gonna find you, alright? Not way the hell out here. But we'll take some precautions. There's gonna be a couple ground rules. Rule number one: always keep the curtains drawn.

[In the present, El opens the curtains]

HHopper

Rule number two: only open the door, if you hear my secret knock. [Demonstrates]

[In the present, El unbolts the door with her powers]

HHopper

And rule number three: Don't ever go out alone... especially not in the daylight.

[In the present, El steps out onto the sunlit porch]

HHopper

That's it. Three rules. I call 'em the, uh... "Don't be stupid" rules. 'Cause we're not stupid, alright?

[In the present, El walks away from the cabin]