I believe it was National Lampoon's Vacation, the first one. I remember seeing this movie when I was a kid, and I'll tell you, Ellen Griswold's soapy wet boobs blew my adolescent mind. Beverly D'Angelo was one of the first crushes I can remember besides Sophia Loren and Jodi from the Fall Guy. Without this movie who knows if I would have been able to become a total perv so early in life. The movie is, ah good, I guess, never really been too big a Chevy Chase fan.