What is the single greatest line in television history? {Please include context & Episode of the Series}

Yeah thats the tricky bit. Most of the greatest TV lines of all time are actually the greatest dialogs of all time

I am that guy.” Amos, The Expanse

Context: He just talked down a mild-mannered scientist from killing a bad guy, telling him “He’s not that guy.”

Does that line support or oppose my contention that context is key?

Buddy Hackman: “You want to know the secret of comedy? Go on, ask me the secret of comedy.”

Johnny Carson: “Okay, what’s the secret of…”

Buddy Hackman: “TIMING!”

Buddy Hacket, not Buddy Hackman (I think). Oops.

Oh and…

Ok, one last time. These are small, but the ones out there are far away.

Father Ted (explaining the concept of perspective to Father Dougal)
Father Ted
Series 2 Episode 1

I like that one.

“You do what you have to do. You take the consequences of your actions”. Barney Miller.

“Book 'em, Danno” - Hawaii 5-0

“Just one more thing…” - Columbo

I don’t think either needs much context. But these are used multiple times in each show, they are not lines used once.

I’d argue those belong in the list of best catchphrases not best lines

Because I don’t want to spoil it for anyone who hasn’t seen the classic Honeymooners episode in which Jackie Gleason’s character is a contestant on a TV quiz show, I’ll give the penultimate line leading to his response:

Host: Who is the composer of Swanee River?

Ralph Kramden: …

Hackett.

Never mind.

That prompted me to search for it.

https://www.youtube.com/watch?v=VpwM7HipPVk

Is there context here, because I don’t get why that’s funny?

Not a list, but two that I always wait for when I run across the episodes scrolling through channels:

Buffy Season 2, Episode 5 (Reptile Boy), after Angel tells her there romance isn’t a fairy tale, no matter how much she wants it to be:

“When you kiss me, I wanna die”

Law & Order : Criminal Intent Season 3, Episode 4 (But Not Forgotten), where Isabel (Alicia Coppola) gives a final farewell to her corrupt husband, who killed her hit-man husband in order to romance an marry her:

“I wouldn’t raise a dog with you.”

IMO, a line that is truly great doesn’t need context. It is either great on it’s face, or it creates context in the beholder’s mind (even if the context it creates is not the one from the TV program). IOW, if you gotta explain it, it’s not great.

Garak’s monologue to Sisko in the same episode:

“That’s why you came to me, isn’t it, Captain? Because you knew I could do those things that you weren’t capable of doing. Well, it worked. And you’ll get what you want, a war between the Romulans and the Dominion. And if your conscience is bothering you, you should soothe it with the knowledge that you may have just saved the entire Alpha Quadrant and all it cost was the life of one Romulan senator, one criminal, and the self-respect of one Starfleet officer. I don’t know about you, but I’d call that a bargain.”

Two from Captain Jean Luc Picard form Star Trek: The Next Generation:

“It is possible to commit no mistakes and still lose. That is not a weakness. That is life.”

“When one has been angry for a very long time, one gets used to it. And it becomes comfortable, like…like old leather. And finally it becomes so familiar that one can’t ever remember feeling any other way”

Sounds like you’re a connoisseur of Tim Allen’s grunts from Home Improvement

Neither of your posts are about single lines, though.

I’ll see you this, and raise you with a line from Fresno, the infamous '80s spoof of prime-time soaps like Dallas:

Foundling Teri Garr, confronting a lineup of men in clown suits: “All right, which one of you bozos is my father?” :face_with_raised_eyebrow: