"[Unlocking the gate] One moment, gentlemen. We have no police on the island, so one has to take certain precautions. [Mark reaches up to touch wire fencing] Oh, I wouldn't touch those wires if I were you, Mr. Smith. There's a slight electrical current passing through them, to keep out the animals and snakes. You see the jungle comes awfully close to us here."
January 1, 1970
https://en.wikiquote.org/wiki/Island_of_Doomed_Men