Dazed and Confused is a classic 90s comedy of the 70s era. There are many great one-liners. "I get older; they stay the same age," is one of the best lines of all movies. Actually McConahy's (sp?) character is one of the best too. The soundtrack is also a huge part of what makes the movie great.
An actual 70s-made classic is Airplane. "You ever seen a grown man naked?" That movie has the most one-liners...
Or any Bill Murray scene in Caddyshack