The Couch Trip
From "A book of Aphorisms" by this reviewer we have under heading "Sanity": You'd need to be mad to want to be sane in a mad world.
This fairly sums up this movie, except that one must not overlook the serious content, namely, the critique of our treatment of society's misfits, and that the salt of the earth may be found within their numbers. To say much more would kill the fun.
So, if you are looking for vintage Matthau, heavily diluted with shrinks gasping for air (space), then go for it.
You won't be disappointed.