Why do humans get goosebumps even when we are not cold?

Goosebumps are basically a biological relic from our ancestors^[3]. While we usually link them to the cold, they are actually a reflex triggered by the sympathetic nervous system when we experience intense emotions like fear, awe, or social stress^[3]. In the animal kingdom, this reaction helped creatures look larger to intimidate threats, but in humans, it has been repurposed by our brain to signal deeply meaningful moments^[3].

You might feel this 'frisson' during:
* Horror movies or eerie scenes^[3].
* Music that hits an emotional peak^[2].
* Adrenaline-pumping moments or eloquent speeches^[2].