Take my favorites--for example, the legend of The Three Kingdoms. As the story is told, when Chang Fei and Kuan Kung first meet, heated words lead to a fight, and when no victor is apparent, they make a pledge of brotherhood.
例如以我自己最愛的三國傳說來看，故事中張飛、關公二人初見面，是大吵進而大打出手，分不出勝負，再結拜為兄弟。