tā / yī xiǎng dào / nián qīng shí / de / qiǔ shì / jiù / zuò zài / shā fā shàng / hē hē dà xiào

他一想到年轻时的糗事，就坐在沙发上呵呵大笑。

Whenever he thinks of an embarrassing incident from his youth, he sits on the sofa and laughs heartily.