Salesman
Roy and Gilbert's fishing trip takes a terrifying turn when the hitchhiker they pick up turns out to be a sociopath on the run from the law. He's killed before, and he lets the two know that as soon as they're no longer useful, he'll kill again. The two friends plot an escape, but the hitchhiker's peculiar physical affliction, an eye that never closes even when he sleeps, makes it impossible for them to tell when they can make a break for it.
Porter (uncredited)
A down-on-his-luck ex-GI finds himself framed for an armored car robbery. When he's finally released for lack of evidence--after having been beaten up and tortured by the police--he sets out to discover who set him up, and why. The trail leads him into Mexico and a web of hired killers and corrupt cops.