Sanford and Son (1972)

S2E9 The Shootout

Title: The Shootout Plot: Lamont spends $50 on a vintage firearm and excitedly presents it to Fred. As Fred enthusiastically reenacts tales of battle, he inadvertently pulls the trigger, unaware that the gun is loaded. The shot flies through the neighbor's window, and moments after a furious argument with Fred, the neighbor vanishes from view. Fred, in a panic, assumes he has fatally harmed him.