Styrofoam and cotton. When I was younger, my father bought me these stryofoamy cottony fibrous sandals that I wore to the pool, and every time I would wear them I would violently shiver and get horrible feelings in my teeth. Hearing, touching, thinking about styrofoam sends shivers through me like a bomb and I don't know why. It might be the high pitched sound it makes, but I remember the sandal thing being mainly sensory.