Brazil caught up in craze for whistling-only WhatsApp groups

Some chats can get up to 600 voice notes a day and reach the 1,024-member limit in less than 24 hours

The WhatsApp groups have one simple rule: typing and speaking are forbidden, on pain of immediate removal.

Only voice notes with whistling are allowed, although the choice of content is up to the sender: it can be an imitation of a bird or a tune such as the theme from The Pink Panther or the introduction to Scorpions’ Wind of Change.

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