Not since the cinematic cannabis heyday of Jeff Spicoli ("Fast Times at Ridgemont High," 1982) and "Withnail & I" (1987) has a fully baked stoner come to such worthy comic life on-screen.
Then, around the midpoint, "Pineapple Express" falls apart and keeps falling, and the comedy, spiced with considerable, unevenly effective violence in that first hour, goes out the window, and in comes all the gore and the bone-crunching.
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In its gleefully befogged first hour, " Pineapple Express" seems to be onto something new: It's a marijuana comedy that keeps shuffling genres, like a stoned blackjack dealer.
The title says it all, and the drama here is will he or won't he?