Sacred Haven of Debauchery

I remember a time when this fat kid from our class, who sat at the desk in front of me and my friend, started picking on us. He turned around, put his hand on our desk, and started complaining. My friend told him to get his hand off the desk. The fat kid didn't listen and kept complaining, so my friend stuck a pen into his hand. Not hard enough to pierce the fat, but hard enough to leave a tattoo in the form of a blue dot.