A Very Harold & Kumar 3D Christmas had me at the cannabis-shaped snowflakes. They waft from the screen onto the lenses of stereoscopic glasses. Ordinarily one doesn't encounter this unlikely combination of low comedy, high ideals, and cheesy optical effects outside of a head shop.
With a scene change every 90 seconds and a gag every 15 or so, this third installment of the Harold & Kumar franchise, nearly funny as the first and funnier than the second, succeeds in its heroic quest to leave no stoner unturned. Think of it as Airplane! with controlled substances.
Two nicely mismatched buddies are now estranged. They are the tightly wound Harold (John Cho), an investment banker with Occupy Wall Street protesters surrounding his office, and the loosey-goosey Kumar (Kal Penn), who has a medical degree but failed his drug test. Harold, now married, lives in an upscale Jersey suburb; Kumar, no longer with his girlfriend, still lives in the Hoboken mancave he once shared with Harold. When Kumar exhales, the 3D smoke gets in your eyes.
Hasn't 3D jumped the shark? Harold asks self-referentially. Yes, it has. But as deployed, 1950s-style, in this geek Dean Martin/Jerry Lewis romp with pot and peyote and ecstasy in place of Johnnie Walker, it taps the funnybone. The 3D jokes are reliably funny. But another running gag, the inadvertent exposure of an apple-cheeked toddler to every drug known to slacker, elicits discomfort rather than laughter.