Who wouldn’t want to see a scene where a dismembered head is re-animated using electricity, then smokes a cigarette? It’s awesome, and belongs to an hilarious middle section of this film, which is done in three parts, each with a different director. The other sections are still gripping, the conclusion especially full of tension and is one of the best I’ve seen for a horror film.
The movie takes the increasingly popular theme of technology turning against humans, and in this version a signal infiltrates all the means of communication to turn people loony. So the streets are littered with previously normal people bashing and slicing each other, and such a level of anarchy is astonishingly entertaining in its absurdity. The film then constantly shifts to the point of view of the infected, showing us how the signal has warped their perception. This is a particularly useful device.