Years ago I heard an old SF/Fantasy radio anthology program where an alcoholic is recruited by the FBI to fight goblins (or kobolds or some underground fantasy race).
The goblins are invisible to sober humans but, with enough booze, they're perceptible. The FBI recruiter comments:
I wish we had men who could drink like you.
At one point the drunken protagonist gets a goblin-sized invisibility cloak that couldn't cover his whole body, leaving his head visible. When a goblin spots him, he sings "I ain't got no body" and scares it off (I have to assume this was before Young Frankenstein).
I thought the name of the episode was "My cup floweth over" and was on X Minus One but episode guides don't list it.
I believe I heard it on WVXU 91.7 in Cincinnati in the 1990s.