Roy: Huh ... I always thought the "revolving door afterlife" was just a metaphor ...

Bureaucratic Deva: Now, you are an adventurer, so that means you're eligible to earn Frequent Dying Miles every time you stay with us...

Balinsky: Oh, Dr. Jackson's gonna die when he sees this!
Dixon: What, again?

IMAGINE WHAT SORT OF MESS THE UNIVERSE WOULD BE IN IF WE KEPT SENDING PEOPLE BACK FROM THE DEAD ON FLIMSY PREMISES.

Don't get the wrong idea, though; coming back from the dead isn't a snap. It's a tough narrative trick that requires time travel, a previously unmentioned clone, a cosmic resurrection, an alternate dimensional rebirth, or an inattentive editor with a drinking problem. But it can be done.

Sometimes it seems that in mutant heaven there are no pearly gates, but instead revolving doors.

She said "I had the strangest dream,
I dreamed I killed you again
Don't make me kill you again,
'Cause I couldn't bear to kill you again."

Oh gosh I forgot to honor our fallen heroes. In my line of work everyone just comes back in a couple months.

Starfield: Blurr is about as unambiguously dead as a Transformer can be, IMO.
KrytenKoro: According to Wyatt, in Animated grey=dead, and only grey=dead. Blurr is still alive.
Starfield: Like I said, as unambiguously dead as a Transformer can be. There's always a chance. (Even when they are gray.)

"Oh dear. I seem to have died. This is very inconvenient."

Jerry the Immortal: "Dying is going to put me out of commission for a few weeks."

Susan: "Dying is usually inconvenient."

"Death has lost its meaning. The doorway between life and death has been cracked open for years. Ever since Superman came back to us. And then Oliver Queen, Hal Jordan, Jason Todd."

Sigma: "Aah! Teddy bears thrown at me! My only weakness! ..For now..." *Falls over dead*
* Less than two seconds later*
Sigma: "Muahahaha! I'm back to get my revenge! *Evil Laugh* So... what was the time?"
Zero: "Hmm... Sorry, not a new record."
Sigma: "Ohhh."

"We're just going to kill you, and then you'll be fine!"

Voll: Hy haff brought hyu de leader ov dose Var Stompers. He iz in need ov medical attention.

Doctor Sun: I will be the judge of that. Where is he? [Vole holds the man's severed head in his hand] Yes. Well. Tricky. But I've seen worse. Let's get him prepped.

Blutarch Mann: "All I ask is that you-" *Blutarch dies mid-sentence*
* Eerie silence*
Engineer: "Uh... Sir? Is he alright?"
Blutarch's secretary: "Give him a moment, dear. He's just dead."
* Life support machine shocks Blutarch back to life*

The coward dies a thousand deaths; the brave man dies but once; the Warrior Princess dies about once a season, to keep in practice.

It’s an interesting thing, death in Science Fiction. With technology so advanced, if the author wants to make sure the reader won’t think the character will be brought back to life, the author can’t just shoot or dismember the character, the character really needs to be disintegrated.
We won’t even TALK about cloning.

Professor Mezzasalma: "...Mittlemind there has a pulse cannon built-in. It killed him, of course, but her gun did blow up."

Moloch von Zinzer: "That ... that was very brave."

Professor Mezzasalma: "Oh, please. Don't start. He'll be smug enough as it is."

"Moving for me is a multi-annual tradition, much like killing John has become."

"Wounds are becoming troublesome. At 8, they may become fatal. Which would be inconvenient."

Fry: "Take that Grim Reaper!"

Bender:(under his breath) "Stupid, ineffective Reaper!"

"Oh no you don't! We know how it goes: you take the body, then he's back in a week!"

"You know, if everyone The Punisher killed turns out to be no more dead than anyone else who "dies" in Marvel Comics, he's going to be in BIG trouble one of these days."