Remeber being a pax on a Minerve DC-9-something on a circular flight from JFK-FDF (Martinique)-PTP (Guadeloupe) (and eventually back to JFK). I was going to Guadeloupe and had to stay on the plane at FDF. I was near the front of the cabin.
Apparently the plane's voice warning box was defective since a tech arrived with a replacement. They then put it through its paces with the cockpit door open. "Fire left engine", "Fire right engine", "Pull up Pull up" and the like. I wonder what most of the pax thought.
The crew may have been French-speaking, but the airplane itself spoke English.