Hello,
My biggest fail happened when I had 12 years old, I was in my class room as usual I was bitting my red pen, but after 10 minutes all the studdens making fun of me and I didn't understood why, when finally my teacher yealling at me and send me to the director, its when I arrived in his office that I understood the problem, my red pen flowed on my lips and there were thinking I did it to distract the audience, The worse is that my teacher asked a punishment for me and gladly my entire class room explain to the director it was a mistake and I didin't had a punishment :)

Since that day I bit only my pencil !
David