I find it tremendously rewarding to see all these enthusiastic comments about this movie here on the IMDb. This is a film that no-one ever seems to have heard of, and it's a guilty pleasure in every way. It makes NO sense, it is essentially claustrophobically confined to one cheap set within which a stream of unlikely characters played by great quirky actors parades by. There is no narrative structure at all, and you're not even sure what the point is by the end, but thanks especially to Lee Marvin and Keenan Wynn, you're fascinated all along the way.
I haven't seen it in years now (something happened to my videotape of it, recorded off of TNT many years ago), but I'd consider it one of my favorite movies on the basis of the fact that I could watch it over and over and always find it satisfying.
It's hard to recommend it for any rational reason, and yet I'd urge any film buff with even a tiny sense of the absurd to watch it some time before you die. You'll never see anything remotely like it, for good reason. But it gives you faith in the concept that just about anything can get produced, if you only believe strongly enough.....