Diabolical 5 Fives
5 x (5 - (5 : 5 : 5)) = 24
Strangely enough, very few people can find this solution!

Pinocchio's nose only grows when he tells a lie, then, saying that his nose will start to grow in that precise instant makes it a bit of an impossibility: the growing of his nose would mean that he actually told the truth, in which case his nose wouldn't be growing, which would make him a liar, in which case his nose would grow, which would make it true... Etc. Creating an infinite strange loop of situations that contradict each other.
Some ones argue that it is not a paradox, because his nose grows when he intentionally LIES, not when he doesn't predict the future.

Italiano

Sapendo che Pinocchio dice un sacco di bugie, quindi se sta dicendo una bugia gli si allungherà il naso. Ma se gli si allunga il naso vorrà dire che ha detto il vero, e allora non avrebbe dovuto allungarglisi! Da qui nasce una situazione impossibile ed un paradosso...

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Français

Sachant que Pinocchio est un fieffé menteur, s'il ment effectivement, son nez s'allongera, mais si son nez s'allonge, cela signifie qu'il aura dit la vérité, et donc son nez ne devrait pas s'allonger... En bref, une situation inextricable! Ce qu'il en ressort, c'est qu'on n'est pas en mesure de prévoir si son nez va s’allonger ou pas...

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Español

Si es mentira lo que dice entonces su nariz debería crecer, ya que cada que pinocchio miente su nariz crece, pero si crece entonces no sería mentira y su no es mentira no tiene que crece...

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