'68 Was A Bad Year

You return from ‘Nam to a city overrun by evil drugs that make hippies murder. But thanks to you, Hell’s plot has failed. One more place to clear: the acid plant, where they make the stuff. Its corroded corridors reek of substances you never used. Psychedelic rock blares. Aiming your shotgun from the hip, the head Satanic pusher is up against a wall. A one-liner before pulling the trigger:
“Take your last hit!”
The remaining demons back off. The factory sinks into the ground. The fog lifts. Walking away from the scene, you’ve won. But will anyone believe you?