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Mason Adams narrates Highway Hangouts, a History Channel documentary that the National Building Museum screens as part of its Roadside America series. Adams may be remembered as Managing Editor Charlie Hume from the Lou Grant television show, but he’s more familiar for his many commercial voice-overs, most often for foodstuffs. From his lips, the words “creamy,” “buttery,” and “piping hot” take on obscene decadence, a mouthwatering allure that brooks no resistance. And so, as flivvers zip by at hot-rod speed across a wacky America filled with smiling gas-station attendants, and restaurants and motels built in toy-box shapes to a schizo stock-music soundtrack, the effect is “Mmm…let’s eat!” At 2 p.m. at the National Building Museum, 401 F St. NW. Free. (202) 272-2448. (Dave Nuttycombe)