Early '70s, a reefer called Iris Queen was plagued by spurious fire alarms when running UMS, as all the reefers of that class were. The crew got into the habit, especially between 1600 and 0800, of going below and cancelling the alarm.
Dinner time in the Saloon, of course the Captain and Chief, with wives, shared to top table and were served first. The pecking order continued, 4th Engineer and Eng. Cadet, sharing the table way at the bottom with 4th Mate and Deck Cadet, were served last. 4th Engineer was Duty Engineer. As the meal went on, the Chief was finishing dessert when the 4th had just been served and the fire alarm sounded.
The Chief waved the 4th down, indicating he would take care of the spurious alarm and went below.
It wasn't a spurious alarm. The end of the main engine lub oil supply line to crossheads, 5 bar or so, had cracked and was spraying hot lub oil onto the adjacent generator exhaust manifold. The Chief never came back up and perished in the blaze.
Discourage incest, ban country "music".