Art Major Physics: No, not Art Major. It was the fart of a firefly turned into a ravenous beast, shredding all those in its path, as Harry reached from an atom and split it, killing the fuck out of the beast.
Batman Can Breathe in Space: In the second chapter, Harry flies through space on a meteor, with no explanation as to how he can breathe. This may be the least ridiculous thing about the fic.
Beeping Computers: In the laboratory of the strange old man and his toothpick weasel, there are computers that serve no purpose beyond soft hums and blinking lights.
Behind a Stick: Rape Radbury appears "from behind nothing much". Yet, he's ten feet tall...
Dark Is Not Evil: Neither Rape Radbury nor the Eldritch Abomination posing as a scientist seem to be particularly awful people. Then again, anyone looks less awful when Harry is around.
Department of Redundancy Department: A borderline example in the line "We are bound in this ligature of lingam, Brother Rape Ape." 'Ligature' and 'lingam' both mean 'symbol', although 'lingam' is often used to refer specifically to phallic symbols. It is the rape ape, after all.
Disintegrator Ray: Dobby's armor fires a beam of light at one of the astronauts, boiling his flesh in another dimension.
Dissimile: "Harry slammed his book shut. It wasn't really a book, because the pages were made of lasers and the words were made of headless women making godless love to dragons made out of motorcycles, but it was still reading."
Earth-Shattering Kaboom: Harry "kills the fuck out of" two planets during the course of the story, and Dumblecop kicks another one in half.
Evil Weapon: Fuckslayer is a particularly unholy example; it's made out of angel menstrual blood, the horns of Satan and his generals, and heaven itself. Harry stores it in a dimension where all screams for naught. It can also destroy planets.
For the Evulz: Apparently Harry's motivation, though he doesn't really seem to get a kick out of it. In fact, he seems more annoyed by the insanity than anything else, such as having him harassed by Rape Radbury, being bound by a Rape Ape and left alone as the children of all different nations and ethnicities (save the Eskimos) bind with the Rape Ape to spread amongst the stars, and being harassed by a weasel with toothpicks for legs.
Gag Penis: The Rape Ape's body is apparently made up entirely of these.
The Men in Black: The old man in the seventh chapter could be interpreted as this, seeing as he's in a laboratory and he has the apparent power to control Harry. He also seems scientific and addresses Harry as "a son". There's also quite a bit of Eldritch Abomination thrown into the mix, seeing as he can remove his own head.
Omnicidal Maniac: After killing everybody in the universe, Harry admonishes Dumbledore to conserve food, otherwise they'll starve, and no one will be around to revive them just to kill them again.
Our Vampires Are Different: In the second chapter, we get astral vampires which are able to bite even when only their head remains, causing vampire cavemen on Mars when Harry throws the heads back into time to Mars, where, er, they bite cavemen.
Harry, to the point that he can do absolutely anything the writer needs him to do in order to have epic descriptions of whatever the hell is going on in the story. He can see sub-atomic particles by squinting, and somehow killed the fuck out of Mercury (not the god, the actual planet), and then killed the fuck out of Venus with Mercury's carcass.
There's also Dumblecop of the Darkmeal, who kicks a planet in half, for no apparent reason, just because he can. With a leg, made out of pistols.
Rule Of Cool: There is absolutely zero logical plot progression, however, there are legs made out of pistols, vampire caveman on Mars and a cursed book with pages MADE OUT OF LASERS and words made out of dragons, made out of motorcycles, making godless love to headless women.
Harry then did fly his meteor through space, [DragonForce starts playing] punching astral vampires in half with his fists encased in fuckfire and throwing their ruined heads into the past where they bit cavemen on mars so that history changed and now there are vampire cavemen on mars.
Trailers Always Lie: Similar to the above mentioned pairing between characters who never appear in the fic, the fic is categorized as "Angst/Romance". The summary, on the other hand, is a fairly honest representation of a few of the events in this fic, which is otherwise virtually impossible to summarize.
Surprisingly for this sort of thing, the author uses proper punctuation, spelling, and grammar. It's somehow better simply because readers don't have to wade through hundreds of misspellings and commas everywhere.