Live frogs thwapping against the windows of a Southern mansion like fat drops of rain soundtrack the supremely goofy and oddly hypnotic FROGS. This accidentally progressive vision of nature getting revenge on the capitalists destroying it — on the Fourth of July, no less! — comes from American International Pictures, the pre-eminent producer of American drive-in fare in the 1970s. But its effect is more like that of a European art-horror picture, so bizarre and clunky it ascends into surrealism as an entire swamp unites to punish a wealthy, wheelchair-bound bastard and his equally intolerable family. Featuring a young Sam Elliott as the film’s hirsute, frequently shirtless environmentalist, who no one listens to until it’s literally raining frogs. And by then, it’s far too late.