The Twilight Zone - The Grave

Lawman Conny Miller rides into a small dusty town not long after the townsfolk have gunned down the man he's been tracking for four months. He feels like he's wasted that four months and someone bets him $20 he hasn't the nerve to visit the dead man's grave. He takes that bet and has little difficulty going to the grave. Leaving it however proves to be another matter however