The National Lampoon reference article from the English Wikipedia on 24-Apr-2004
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National Lampoon

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The National Lampoon began in 1970 as an offshoot of the Harvard Lampoon humor magazine. Its heyday was the 1970s, when the magazine regularly skewered pop culture, the counterculture and politics with recklessness. The magazine also spun off an off-Broadway hit (Lemmings), a series of popular record albums, a radio show and a line of motion pictures, most famously Animal House in 1978. One National Lampoon movie, National Lampoon's Vacation (1983), spawned a series of three sequels, including National Lampoon's European Vacation (1985), National Lampoon's Christmas Vacation (1989), and Vegas Vacation (1997).

Other National Lampoon movies: