You can literally become a bird and fly around Los Santos.
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You can literally become a bird and fly around Los Santos.

In the Enhanced version, eating a Peyote Plant transforms the player into a random animal — including birds that you can fly across the entire map using actual airplane controls, interacting with NPCs who react to you as if you're just another animal.

Source: Animals (GTA V) — CC BY-SA

The full story

One minute you're Trevor, next you're a cow hoofing it down Vinewood Boulevard while NPCs barely bat an eye.
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One minute you're Trevor, next you're a cow hoofing it down Vinewood Boulevard while NPCs barely bat an eye.

Peyote cougar mode: either you're the hunter or Trevor's becoming cat food, no in-between.
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Peyote cougar mode: either you're the hunter or Trevor's becoming cat food, no in-between.

Monkey business in Los Santos: fly across the map, terrorize pedestrians, and nobody even calls the cops on your tiny primate ass.
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Monkey business in Los Santos: fly across the map, terrorize pedestrians, and nobody even calls the cops on your tiny primate ass.

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