There have been many comments about light switches and this is “one light switch away from” electrifying or possibly electrocuting the user.
We take modern wiring for granted, fumbling for a light switch in a dark room without the possibility of getting shocked.
This is more like something Dracula would have used to terrify movie audiences. The live wire terminals, the wooden handle, the sizzle sparks as the terminals make contact, all state of the art equipment in 1920.
This light switch is one switch away from ruining a beautiful day.