This is it, the day we’ve been waiting for two full decades (or, at least, since we first heard it was happening back in December): the Huey Lewis plot song written specifically for the David Gordon Green-driected, Judd Apatow-produced stoner comedy Pineapple Express has hit the web! The Playlist first posted a clip of the song last night; today, Whitney at Pop Candy points to the full thing, available for streaming or download on MySpace.

It’s very much in classic Huey Lewis plot song mode, complete with gratuitous hand claps and sax solo. It’s not as directly narrative as, say, “Back in Time” (above), but it’s slightly more literally connected to the film than, like, “The Power of Love.” A sample from the chorus: “How did we get into this mess? Pineapple Express! Can’t deal with this stress! Totally gone, cause we’re on, Pineapple Express!” It is the best, and it is also totally the worst.

As we’ve discussed before, plot songs take the science of the source cue to a new level. After the jump, a brief, video-guided journey through plot song history. Let us know what we’ve left out.

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