5

На свете нет ничего невозможного.

Любой парень на свете бы ...

I can't quite put my finger on why "на свете" needs to be used in the first two instances and "в мире" in the third. How do these two figurative expressions compare?

Если вы собираетесь на самую страшную вечеринку в мире, ...

3

В мире is based on facts about the world as objective and verifiable thing. Like:

Байкал - самое глубокое озеро в мире.

Baikal is the deepest lake in the world.

На свете is more of a hyperbole that isn't meant to be taken literally.

Лучший парень на свете.

Best guy in the world.

2

My feeling is that

на свете usually refers to of all times, ever and to immaterial world

в мире - in the world presently and in material world

But this distinction isn't hard and fast, they might overlap or depend on the context and phraseology conventions.

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