A Japanese ship was sailing on the open sea. The captain went for a shower, removing his ring and placing it on the bedside table. When he returned, he found it had gone missing. The captain immediately called the suspected crew members and asked each one where they were and what were they doing in the last 15 minutes.
The cook said, “I was in the kitchen preparing meat for dinner.”
The engineer , “I was in the engine room working on the generators.”
The seaman said, “I was on the mast correcting the flag which was hung upside down by mistake.”
The radio officer said, “I was on the radio, messaging to the company about our arrival.”
The navigation officer said, “I was asleep in my cabin.”
The captain immediately caught the thief. How?