Scraping your fingernails on the 'waxy' side of lined paper. I'm cringing just from typing this.
when i hit my finger against my wall and it scratches like its on a chalkboard
When I wash my hands then touch paper.You know that feel bro?
Besides this, I must be one of the few people who can run their nails down a chalkboard and not feel anything
when some person is eating and his entire mouth is fully smeared with sauce and he doesn't wipe it off, or if someone spits food when talking with his mouth full.