The Twenty-Three Reasons to Pick a Fight

Dominance
Frustration
Defense
Principle
Boredom/Ennui
Thrillseeking Tendencies
Acquisition
Just Going With It
Not Getting Laid Enough
Sadism
Masochism
To Annihilate Those That Oppose or Offend You
Insecurity
Impress Chicks
Impress Dudes
Suicide
Revenge
Anger - current
Forced To
Part of Your Cover Identity
Survive Prison
Need Bruises
Distract Them