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The Recorded Snoring (illustration)
FILE No.184Unsolved

The Recorded Snoring

Difficulty ★★☆about 5 minLocked RoomSoundDisguise
Snoring from a room repeats at regular intervals.

Case Record

From the room of its resident, who was supposed to be traveling, snoring was heard all through the night. When it was recorded and examined, a 2-minute stretch of sound was repeated over and over. Every 2 minutes, the same small cough appears, with exactly the same sound.

In the morning, when the door of the room was opened, no one was inside.

Your question

What was the snoring?

Case Files

Diagram

The night snoringA 2-minute sound, repeated (same cough at the same spot every time)In the morning the room was empty. What was the snoring?
Diagram

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

Is a person's cough exactly the same every time?

Open hint 2

Why does the same sound repeat every 2 minutes?

Open hint 3

Who was in the room?

Solve It

Your question

What was the snoring?

Choose the answer closest to the truth.

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The Truth

A recording of snoring was being played

The answer is "A recording of snoring was being played."

A person never makes the same cough with exactly the same sound every 2 minutes. The same sound repeating exactly is proof that a recording is being played over and over.

If it were snoring from the next room, the cough would differ each time. No one was in the room, so the chance of under the floor or a dog is small.

A person never repeats a sound exactlyCompareDetailA living personEach cough differs slightlyThis recordingExactly identical every 2 minutesConclusionA recording was being replayed
Diagram of the solution

Key Points

  • Focus on the details of the sound being exactly the same
  • Think of the traits of a machine
  • Combine with the situation in the room

Why people get fooled

Because you think snoring means someone is there.

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