What causes shivers/ good feeling buzzes?

Like when someone says “someone just walked on your grave” or “I just felt a ghost”
And the feeling good buzzes are something I get when say I listen to some music I love, I et a massive random split second rush thorugh my head and possibly my body going upwards. WTF is that about?
anyone know what causes it?

I’ve been told I’m being vague. It’s really hard to explain though. I guess it’s like, jumping in a cold bath or something, and getting that freezing feeling all over your body. Except, it sometimes feels nice. Hard to explain!