Straight to Hell (1987)

A gang of bank robbers with a suitcase full of money go to the desert to hide out. After burying the loot, they find their way to a surreal town full of cowboys who drink an awful lot of coffee. The townspeople are hostile to the outsiders at first, but seem to accept them once they've killed a couple of people. After a while, a mysterious man named Dade arrives, who seems to have unpleasant business to settle with the robbers. A free-for-all shoot-em-up ensues.