Caught in a Rip-Off (1974)
From the people who brought you "Cheating" and "Shake Hands with Danger" comes this 1974 scare film about shoplifting, entitled "Caught in a Rip-Off." Some unseen guy who sniffed one too many cans of spray paint (to paraphrase the words of one YouTube commenter) tells about how clerks in your local Hobby Lobby employ one sly tactic after another to discourage burglary. Accentuated with weird (but not atypical) 1970s Moog synthesizer musical stings, this makes for an interesting subject that is riff-worthy.
Here is the YouTube link below: