"You want a prediction about the weather, you're asking the wrong Phil. I'll give you a winter prediction: It's gonna be cold, it's gonna be grey, and it's gonna last you for the rest of your life."

Koizumi: We've entered an endless recursion of time.
Kyon: Huh? What?
Koizumi: We've entered an endless recursion of time.
Kyon: Huh? What?
— The Melancholy of Haruhi Suzumiya, "Endless Eight"

Cat: So, what is it?
Kryten: I've never seen one before — no one has — but I'm guessing it's a white hole.
Rimmer: A white hole?
Kryten: Every action has an equal and opposite reaction. A black hole sucks time and matter out of the universe: a white hole returns it.
Lister: So, that thing's spewing time back into the universe?
Kryten: Precisely. That's why we're experiencing these curious time phenomena on board.
Cat: So, what is it?
Kryten: I've never seen one before — no one has — but I'm guessing it's a white hole.
Rimmer: A white hole?
Kryten: Every action has an equal and opposite reaction. A black hole sucks time and matter out of the universe: a white hole returns it.
Lister: So, that thing's spewing time back into the universe?
Kryten: Precisely. That's why we're experiencing these curious time phenomena on board.
Lister: What time phenomena?
Kryten: Like just then, when time repeated itself.
Cat: So, what is it?
— Red Dwarf, "White Hole"

Mario: Wouldn't it be nice if every day were Christmas?
Luigi: Uh, not exactly.
— A YouTube Poop based on the Super Mario World Christmas Episode

Guildenstern: You know your way around?
The Player: I've been here before.
Guildenstern: We're still finding our feet.
The Player: I should concentrate on not losing your heads.
Guildenstern: Do you speak from knowledge?
The Player: Precedent.
Guildenstern: You've been here before.
The Player: And I know which way the wind is blowing.
—Rosencrantz and Guildenstern Are Dead

Carter: We haven't been to P4X-639.
O'Neill: Yes we have. 'No we haven't.' That's what you were gonna say.
Daniel: Of course that's what I was gonna say.
O'Neill: ...
O'Neill: Ok, bad example.
—Stargate SG-1, "Window of Opportunity"

"What happened? Everything... started over..."

Sam: Okay, look, yesterday was Tuesday, right? But today is Tuesday too!

Dean: Yeah. No. Good. You're totally balanced.

I can't remember how this all got started
But I can tell you exactly how it will end
Every day is exactly the same
Every day is exactly the same

I think I've been here before
I think I've run into you
I know the things that you do
'cause this is deja vu

Nathan: You're stuck in my se-
Audrey Second-favourite Bill Murray movie, yeah we've had this conversation before.

Anya: This whole day - has it gone by too quickly for you?

Buffy: No. No, I don't think that's exactly the problem.

Tucker: This is just like last time! Once Wyoming lost, everything seemed to-
*Wyoming resets time to a few minutes before*
Tucker: ...reset.