Is it normal that i like to eat pencil shavings?

It started when I was about 9, I was in school. I needed to sharpen my pencil so I took out my sharpener and sharpened my pencil. I accidentally dropped the sharpener, and the shavings went EVERYWHERE. Suddenly, I had some sort of attraction to them and practically lunged at them and threw them into my mouth. They taste crispy and crunchy and just perfect. People make fun of me. Is it normal?