It's hard to express just how much I fucking love this song. It is, quite simply, a motherfucker*. I'd advise turning this up very, very loud and playing it at least twice.
Quick note for anyone whose appetite has been whetted by this and wants to check out Mad River's glorious first LP, do not buy the double cd reissue that's got the inferior second album, Paradise Bar & Grill, in the same package. The reason Mad River sounds so weird and wired is that it was accidentally mastered at slightly too high a speed, giving it a sharp, edgy, bad trip vibe, and someone decided to remaster the fucker not only at the correct speed, but in such a way as to dull the hugely trebly impact of the three (oh yes, three) guitarists, rendering one of 'em almost inaudible on some tracks. It's a fucking disgrace, and I urge you to seek out an unfucked-with copy.
*And the theme song of my late teenage years. But we'll say no more about that.