I didn't realise there was a rough link to culture! How interesting! Cold shivers, isn't there a saying that someone is walking on your grave?
Idioms, the bane of my speaking in Dutch... I never understand what people mean, only what they say exactly... I have no ear for the idioms in my non native language!
Funny that I remembered that cultural factoid, amazing how the mind remembers things like that. Anywho, probably going to keep that in mind whenever I feel a gust of cold air. And yeah, idioms are quite scary to just hear - they are the language's own inside joke before inside jokes were a thing.