beside oneself 失去控制，得意忘形
【例句】He was beside himself when his wife gave birth to their first child.
【误解】妻子生下第一个孩子时，他就在身边。
【正确】妻子生下第一个孩子时，他欣喜若狂。
【说明】beside oneself意思是“（由于气愤或激动等而）失去控制”、“得意忘形”。