Thanksgiving: A knife-wielding Serial Killer dressed as a Thanksgiving pilgrim kills people in the middle of the Plymouth Thanksgiving Parade, and then decapitates people while they're having sex without the other party even realizing.
A sky-scraper sized, ship-smashing squid which sadly didn't make it into the 3rd film. Guess not even POTC3 has that great a capacity.
Pirates of the Caribbean: At World's End is summed up as thus: A Zombie Pirate captain lord teams up with his rival Badass Normal Pirate's crew to defy proven fact that the earth is round and sail over the edge to bring said Badass Normal Pirate back from the dead (Making him a Badass Normal Zombie Pirate Captain) so that he may lead the charge against an unholy alliance between Zombie mutant pirate demons led by the Zombie mutant sea devil pirate captain and a Tea Company. And the zombie pirate monkey is in it. And a hoodoo mystic Witch Doctor Sea Goddess.
Likewise, Mothra in the Rebirth of Mothra films fall under this. You've got Mothra Leo, Armor Mothra, Aqua Mothra, Light-Speed Mothra, and Eternal Mothra. Oh, by the way, these are all different forms of the exact same monster.
Samurai Vampire Bikers From Hell.
Biker movies create all kinds of possibilities. Another is Psychomania!, with undead bikers. Also, Werewolves On Wheels.
By the end of Van Helsing, the title character is an Angel Werewolf Vampire-Hunter in a Badass Longcoat wielding an Automatic Crossbow whose sidekick is a Sexually Active Swearing Friar Who Designs 18th Century Anti-Vampire Hand Grenades. And it flopped at the box office!
The forgettable movie Ring of Darkness involves a zombie boy band.
The Hellboy film's version of Kroenen is a Gas mask-fetishist Ninja Nazi Occultist Zombie Clockwork Cyborg Gimp Puppet. Also, he's fighting a heroic demon who is Catholic, a mutant fish man, and a pyrokineticist, all under the tutelage of John Hurt.
Death Race: race car Prison convicts in a Blood Sport fight to the death, using heavily armored Mustangs mounted with miniguns and napalm. Oh, and there's hot minority women's prisoners brought in. And The Transporter stars.
The original had a cheesecake Nazi and Sly Stallone breaking a violin over some dude's head. That's got to help it.
The Tim Burton film Pee-wee's Big Adventure has Pee-Wee Herman meet a magician, a fortune-teller, an escaped convict, a zombie truck driver, a giant, a hobo, cowboys, and bikers - and then he ends up getting chased by water-skiers, Santa Claus, and Godzilla while interrupting the filming of a Twisted Sister music video. And then he gets a movie made about his life in which James Brolin (playing Pee-Wee) fights ninjas with Morgan Fairchild.
German movie Der Goldene Nazivampir von Absam 2 ?8364;“ Das Geheimnis von Schloæ#376; Kottlitz : Exactly What It Says on the Tin. ("The Golden Nazi Vampires of Absam [a mountain town in Austria] 2 - The Secrets of Castle Kottlitz.")
Dead Alive (also known as Braindead). Father McGruder fights off zombies with his Ninja like martial arts skills after proclaiming "I kick ass for the Lord!". Soon after his ascent to Ninja Priest he becomes zombified making him now a Ninja Priest Zombie.
Kung-fu Zombie. The title itself is nearly enough to qualify. The movie also has ghosts, Nice Hats and a kung-fu vampire on fire.
Star Wars - Jedi Knights. Think about it - they're samurai wizards, with rocket ships and Laser Blades. Darth Vader is a cyborg samurai astronaut wizard race-car driver, and his boss shoots lightning out of his fingers.
Most of the Syfy Channel Original movies are this. Take Mega Shark vs. Giant Octopus for example, it's a movie about a Megalodon big enough to snap a battle ship in half in one bite that can jump high enough to eat a jet liner about to fight a Giant Octopus big enough to crush an oil rig and levels Tokyo, the two of which have been frozen for eons.
D.E.B.S. is about a school of school-girl outfit wearing secret agents who's top student is a budding lesbian who falls for the worlds most notorious criminal.
Dude, Where's My Car? is about two stoners who have a madcap adventure involving aliens, religious cultists, jocks, a transsexual stripper, and llamas - er, ostriches. Oh, and somewhere along the way they learn to speak Japanese. The title is derived from a line in The Big Lebowski
Mulholland Dr. could be seen this way. Two lesbians, one amnesiac and the other a possibly coked-out and psychotic starlet, team up to solve the mystery of the amnesiac's identity. The starlet's inability to catch a break in Hollywood is attributed to Mafiosos who are controlled by a dwarf in a tall-person costume and a cowboy with no eyebrows. Oh, and outside of dream-world, the lesbians just might be a call girl and her madame.
Alien: The Facehugger is a Severed Hand Vagina Scorpion Rapist. And all the more Squicktacular for it. Its offspring is essentially made out of penises and vaginas.
Universal Soldier has Bioaugmented Cyborg Reanimated Military Servicemen that are used for Black Ops missions, and are given a memory clearance drug to control them, while they are kept in cold storage to keep them from overheating and going berserk. They make use of advanced body armour to increase their Made of Iron status, and a powerful super steroid to improve their superhuman strength, speed and toughness, at the cost of making it harder to control them.
By the third movie (second in canon), they begin using gene therapy to make Super Unisols or Super Supersoldiers and cloning to make more of them and to grow replacement parts for them when they sustain massive damage. These Super Unisols can be controlled by chips implanted in their heads, that also are used for memory clearance.
By the fourth movie (third in canon), They begin manufacturing Cloned Super Unisols, that they use as Sleeper Agents, complete with implanted fake memories and lives that can be dissolved with the switch of a button when they're activated. They can be anyone you know, anywhere, at any time. These Cloned Super Unisols are much more stronger, tougher and faster then both regular Unisols and Super Unisols, and they can grow back severed parts of their limbs and appendages. There's also a seedy sex shop in the fourth movie, that engages in a whole other level of fetishes that only Unisols can handle.
Top Secret! features a musical number regarding "Skeet Surfing" (and apparently the singer had a career of "Skeet X" songs!)
Communist Robot Alien, it's a low budget movie about communist allying with alien and build a robot.
The Avengers: Tony Stark combines this with Insult Backfire. When Steve Rogers asks him what he'd be without his Powered Armor, Tony replies 'genius billionaire playboy philanthropist'. Plus, at least two Norse gods prominently feature in the film.
Yor: The Hunter from the Future at first appears to be confined to a fairly consistent, if anachronistic, aesthetic: cavemen fight other cavemen and occasionally dinosaurs, and all the awesomeness either comes from the basic setup or from the fact that Yor himself is played by Reb Brown, and he yells a lot and does impossible things. As the film progresses, it starts to get weirder: before you know it, Reb is setting Ancient Egyptian mummies on fire, and then he's found a laser gun and is fighting robots built by an evil eugenicistMad Scientist, because it turns out the whole thing is set After the End.
The Warriors is what you get when you try to make this trope realistic and gritty and halfway succeed. It's Noble Savages (one of whom is a cowboy named Cowboy) from an amusement park traveling on the subway and fighting skinheads, Day-Glo baseball demons, hillbillies on roller skates, and bikers - all while fleeing from ghetto ninjas. (The video game takes it Up to Eleven with some new characters, including a Monster Clown.)