Here's a premium rate phone number I have not stumbled before - "Helium call". It is supposed to transfer the voice of the caller (and also called) to hight pitch that you get when you have just inhaled helium. Quite a fun idea, at very steep price: the time I checked 1.50 euros per minute..
In principle this would not be that hard to code in to modern smartphone software, at least one using some flavour of push to talk, hmm... 8-)
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