Whistling indoors summons malevolent entities
Your upbeat little tune is actually a siren song for demons, apparently. Theatrical and maritime traditions long held that whistling indoors or below deck was an open invitation to malicious forces. It was believed that unseen spirits communicated through shrill tones, meaning your cheerful whistling was interpreted as a direct challenge to the unseen realm.

This article describes beliefs and cultural traditions, which are not necessarily scientifically established facts.
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