A robot?!
And then, of course, in the finale, a robot-like device is used.
In Season 1, Walt and Jesse are preparing to raid a business to steal a barrel of methylamine. Walt gives Jesse the ski masks he bought to hide their faces; they’re brightly patterned, and each has a fluffy pom-pom on top.
Jesse: What’s this?
Walt: It’s all the store had.
Jesse: Then you go to a different store.
Skyler: You look terrible.
Walt: Yeah. But I feel good.
Saul to Walt Jr.:
“Don’t drink and drive. But if you do - call me!”
“We tried to poison you because you’re an insane, degenerate piece of filth, and you deserve to die.” - Walt, to Tuco.
“Let’s start with some tough love, all right? You ready for this? Here goes. You two suck at peddling meth.” - Saul, to Walt and Jessie.
*“You brought a meth lab, to the AIRPORT?!” * - Walt, to Jessie.
“As to your dead guy, occupational hazard. Drug dealer getting shot? I’m gonna go out on a limb here and say it’s been known to happen.” - Saul, to Jessie.
“Gatorade me, bitch!” - Jessie.
*“Did you just bring a bomb into a hospital?!” * - Jessie to Walt.
I love the symmetry. 
“Run.”
In the junkyard, testing the giant magnet for the evidence room caper:
Old Joe:Check your pockets one more time for me please. Credit cards? You want that plastic working come Miller time.
Mike: You know, I can foresee a lot of possible outcomes for this thing and not a single one of them involves Miller time.
Walter: Yeah, so…so where do you transact business? Enlighten me.
Jesse: I don’t know. How about Taco Cabeza? Half the deals I’ve ever done went down at Taco Cabeza. Nice and public. Open 24 hours. Nobody ever gets shot at Taco Cabeza. Hell, why not the mall? You know, wait at the Gap. “Hey! It’s time for the meet!” You know, I’ll put down the flat-front khakis, head on over, grab an Orange Julius. Skip the part where psycho lunatic Tuco, you know, comes and steals my drugs and leaves me bleeding to death.
And then later, while meeting in a junkyard with Tuco -
Tuco: Is the mall closed?
“Better call Saul!”