Damien always had a burning hatred for Cartmen since fourth grade, and it formed into intense bullying. and it got bad, holy water was involved once. Two years after he graduated high school, he saw Cartmen again and had a huge argument that quickly became physical. Pip had to drag Damien out of the fight and take him home, and Damien was pissed. When Pip and Damien got home, he threw a plate on the ground and started just having a rageful freakout...and became a walking fire hazard.