He went to the party to blow off steam after failing the exam.

　　Boiling point：怒点（让人愤怒的最后一个时刻）

　　My boiling point is singing, so don't sing unless you want a black eye.

　　Chew someone out：愤怒责骂

　　I chewed him out when he said he wouldn't come to the party.

　　Fly off the handle：愤怒

　　I'm sorry I accidentally spilled you drink, but there's no need to fly off the handle.

　　Give someone a hard time：很受难为

　　Indeed he would have a very hard time to give an explanation and make his apologies.

　　Give someone a piece of one's mind：责骂某人

　　I'll give him a piece of my mind if he is rude to you next time.

　　Go bananas：发疯

　　The children will go bananas when they see the cute little puppy.

　　Hot under the collar：发疯

　　Your nagging is making me hot under the collar.

　　Lose one's cool: 沉不住气

　　Don't lose your cool, man. You're a gentleman, remember?