Start by drinking an entire Dunkin' Donuts Box of Joe; that's pretty much where Crank starts off. Then it takes off at a blinding pace. Writer/directors Mark Neveldine and Brian Taylor have taken the concept of an "overpumped action movie" very literally. While it very few socially redeeming features, at the very least the film does render cocaine pretty much obsolete.
I'm serious. Raz and I went to see this film, we caught a 5:10 showing and we didn't come down off of it until several hours later. The film is told from the point of view of protagonist Chev Chelios (Jason Statham), who has been poisoned and must keep his adrenaline up in order to stay alive long enough to bring Action Movie Justice™ to the bad guys. Of course, this sort of thing takes its toll, and part of the fun of the movie is that the photography and montage is done in such a way as so to emphasize his state of mind at any given point. Thus, each time he does something different in order to get himself pumping again (anything from getting himself into a pointless fight to doing massive amounts of drugs), the film's style changes to match.
The movie tosses any number of weird references in there; for example, scene changes are marked by Google Earth finding the various locations the characters are in. Amy Smart appears as Statham's ditzy hippie girlfriend, Dwight Yoakum is Statham's doctor, while Napolean Dynamite's Pedro, Efren Ramirez, makes an appearance as... well, I wouldn't want to spoil it. There is a lot of humor in the film, and even though a lot of it (well, most of it, really) is rather tasteless, the blinding pace that the story makes necessary, Statham's screen presence and the film's brevity (it runs a little over an hour plus credits, thus avoiding the common mistake of padding a simple idea out too much) makes for one of the most intense amusement park rides you'll ever find.
When discussing B movies, the question of whether it is "good" or not is less important than how effective it is at accomplishing its goals, and in that regard, Crank does what it sets out to do very well. Is Crank a really good movie? Not so much. But it certainly is entertaining for it's entire (brief) length, and, more importantly, the title is an accurate description of the effect the movie has on the viewer.