Humanity's comeuppance and death-machine tourneys.

REVENGE!

Is exactly what Megalodon is getting in the above scene. Moments after surviving battleship cannons (And trashing said battleship), in an act of seeming retribution, Megalodon bites a chunk outta the Golden Gate Bridge.
Because that's the kinda movie "Mega-Shark VS Giant Octopus" is. A juvenile one.

The military conducts experiments with sonar. Whales go crazy and ram into a glacier, Megalodon and Giant Octopus are freed. They begin to rampage across the globe, sowing terror and destruction. Fearing it's the end of times, the US military turns to oceanographer Emma Macneil and her Irish mentor Lamar Sanders to help save the day. Oh, and they're helped by a token Asian scientist as well. go figure.
So, I don't think I even need to pick this film apart for anyone reading this. I mean, you're either going to watch it or not simply based on the fucking title. It pretty much tells you what you're in for. There's a big-ass shark, and it's fucking angry. There's also a big-ass cephalopod, and it's got attitude. There's also Lorenzo Lamas and he's got the pony-tail to end all pony-tails.

Talk revolves around what the possible meaning of the creatures is. "Have we pushed mother nature too far? Is this punishment for melting the polar ice-caps?" that kinda trite eco-friendly bullshit. Oh, and apparently the Japanese government likes imprisoning people on a lark, and all the Japanese speak English amongst one-another with thick accents. Coz that's just the kinda world were living in! God, what a bad movie. Good for a few laughs though, in fact, better than any recent comedy I can think of. I guess that says something about the populaces steady decline in actual sense of humor.

Carradine, realizing that he's starring in yet ANOTHER Corman film.

Now, while "Mega-Shark/Giant Octopus" was awkward-bad vaguely funny, Deathsport was fucking epic/bad uber-funny. Set after "The Great Neutron" wars, David Carradine stars as "Kazz Oshay". Kazz is a "range-guide" which in post apocalypse jargon must translate into "Ubermensch possessed of telepathic powers" since he pretty much plows through armed motorcycle battalions left right and center like nobodies business while transmitting thoughts to his costarlet.

Anyhoo, plot, plot, what's the plot? Well, a dictator named "Lord Zirpola" (High up on my list of redonkulous names) decides that he wants to spice up the Deathsport, a gladitorial competition he's enforced over the death penalty. His method for spicing up said game involves capturing range-guides and making them fight against Zirpola's "Death-Machines"...which are essentially silver-motorcycles with lasers attached to them.
Who is tasked with this most odious of duties? Ex range-guide Ankar Moor, a man with a grudge against his former brothers and sisters. Lots of laser's end up being fired, city's (Inexplicably) explode, and cheesy sex scenes abound.

I don't even know where to begin. In a way, there's a lot that can be said about Deathsport, but a lot that one might as well not say, since the film's own stupidity is implicit in the sodding title. The dialogue is something else, running the gamut of cliches such as "Now taste my blade!" to making attempts at faux-epic-ness by referencing past battles and making the fights portrayed seem like a big deal. Though, of course, it's hard to take any fight seriously when the swords are made of quartz..well..plastic. But at least they make zapping sound effects when they're sheathed!

All in all, if you want a great laugh, Deathsport's pretty hard to beat. The action's unbearably dumb and half the sets are backdrops. It lacks any socio-political commentary in contrast with it's spiritual prequel, "Deathrace 2000" and features a plot that seems pieced together by a twelve year-old who thinks Heavy Metal magazine is high literature, but all these horrible elements add up to something pretty special. Mega-Shark on the other hand is best left to re-runs on the SyFy channel.