what causes a fight is anger and/or revenge EX 1: "OH my gosh Luke cheated on me with that ugly blonde Jesica...I might just go fight her to get back my boyfriend'
EX 2:(person one)"Dude watch where your going next time I almost broke my new phone." * person 2 scoffs and laughs*(person 2) "yeah right like I'll listen to a scrony little kid" *person 2 walks off a little ans person on calls back* (person one) " hey stupid wanna fight!?!"