Watching this movie almost 40 years after it came out cannot capture how irreverent it felt in 1969.  The world has become so much cruder and the language so much more coarse that this feels much like a family film today.  It is funny, yes, but some of it feels dated.  Comedy is often tied to its time and doesn't travel to a later time so well.  Yet, much of the movie remains terrific and classic.  There are many lines that have become part of the language ("it is if you're doing it right", for example).  Just go up to anyone who knows the film and say "abt natural" or "I have a gub" and they will likely begin to chuckle.  And, of course, there is the soap and shoe polish gun in the rain.