One of my all time favourite films, I believe It was Steve martins first major film, It is his best performance, It's even better than Man with two brains.
I still remember parts of the film and they still make me laugh even now, such classic songs as "picking out a thermos for you" I still sing it to my wife when we buy a new flask (sad I know).
There are so many memorable parts, I won't spoil the film by mentioning them, buy it (and what a bargain priced) and enjoy Steve Martin at his best playing the innocent fool.