During his magic show, he made a pratfall when all the props fell to the ground.

pratfall 是由 prat（屁股）和 fall（跌倒）组成的复合词，字面意思是"屁股着地的跌倒"。在表演艺术中特指"故意设计的滑稽摔倒"，常用来制造喜剧效果。这里引申为"出丑、闹笑话"的意思。