The more observant of readers might have noticed the subtle pun in the title. For you see, Braindead is a very bloody film. In fact, if I am not mistaken, it still holds the record of "Film for which the most artificial blood was used." And even if I am mistaken on that, it is still a film with a ridiculous amount of gore.
Braindead was directed by Peter Jackson. Yes, the dude who later went on to direct the Lord of the Rings trilogy. Personally, though, I much prefer his early work. His very first film, for example, Bad Taste, is a masterpiece if you consider it's basically a home-made project done by some friends with too much spare time. Fortunately, people with money realised this too, and they thought "If he can do this with such limited resources, just imagine what he can do with a proper budget." And we should all be very grateful that they did.
Enough Jackson worshipping, back to Braindead. Not only does it have an overabundance of gore, it is also utterly hilarious. Which of us doesn't remember such immortal lines as "Your mother ate my dog!" or "I kick arse for the lord!" (The latter said in a New Zealand accent thick enough to carve a 4-bedroom house from, and you'd still have room for a garage)?
There's not a whole lot of plot to be found, but then again, in a film whose climactic scene consists of a house full of zombies, a hero with a lawnmower, and a heroine with a blender, who needs a plot? Not me, that's for sure.
Fun fact: Did you know that the man dressed as Father Christmas who stabs Sergeant Angel in the hand in Hot Fuzz is, in fact, Peter Jackson? Well, now you do.
And now go (re-)watch Braindead.