To Get Angry
To Get Mad
intransitive verb, godan verb
おこる
起こる (おこる) To Occur, To Happen, To Take Place
怒る (おこる) To Get Angry, To Get Mad
怒らせる (おこらせる) To Anger Someone, To Provoke, To Offend Someone
腹立つ (はらだつ、はらたつ) To Get Mad, To Get Angry
I would Get Angry 怒る if that Occurred 起こる too.