Apparition:(she counts off his crimes to the tick of the clock) One. He's late. Two. He already has a girlfriend. Three. He gives bad gifts — a cactus, of all things. Four. He's late. Five. He already has a girlfriend. Six... Ultra Boy: I'm late.
The Oracle in the Azrael Annual #2 (a Legends of the Dead Earth Elseworld):
Oracle: Shut your mouth and open your ears. We oracles never repeat ourselves and I mean that most sincerely. Never, never repeat ourselves, understand?
DC Comics. "DC" stands for Detective Comics, ergo their name is Detective Comics Comics. They also publish a series called Detective Comics. Which means it's Detective Comics Comics' Detective Comics. And the comics they publish are Detective Comics Comics' comics.
DC has a series of omnibus reprints of comics, called Showcase Presents. One volume reprints the 1950's comic book Showcase, so it's Showcase Presents Showcase. So... Detective Comics Comics Presents Showcase Presents Showcase.
This exchange from a "Webelos Woody" strip in Boys' Life
Restaurant Patron: I'll have toasted toast on toast with a side order of toast. Waiter: Would you like toast with that? Restaurant Patron:No!
In the Strontium Dog arc "Bitch", a senile and completely clueless Ronald Reagan has been kidnapped by extra-terrestrial aliens from another planet and addresses the following people when reading the ransom note from the aliens who kidnapped a senile and completely clueless Ronald Reagan and are now holding him for ransom.
Ronald Reagan: I'd like to assure Nancy and Larry and George and Larry and George and Larry and all the people this great country of ours that I'm okay.
Superboy Prime: I'll kill you! I'll kill you to DEATH!
Deathstroke the Terminator. Yes thank you, we gathered that you kill people from the first bit. Unless you're also responsible for laying off employees, "the Terminator" is not needed. The name actually came about by an error in his introductory issue, where he was referred to first as Deathstroke, then as the Terminator, so they decided to combine them.
In the superhero comic series Runaways, the titular heroes' secret headquarters is situated under The La Brea Tar Sands, which, as a guard pointed out, means "The The Tar Tar Sands."
In the Lucky Luke book "The Oklahoma Run", Luke encounters a traveling salesman who can sell him fresh water, whisky, fruit, whisky, (insert a lot more here) and whisky.
The title of The Dandy Special issue 7: Desperate Dan in Dan in Japan. So Dan's in himself then? ◊
The Kindle version of the third Simon's Cat book is titled both on the website and the download itself as "Simon's Cat: In Kitten Chaos: In Kitten Chaos (Simons Cat 3)"