make an exhibition of oneself 出洋相

“出洋相”，中文俗语，意思是指在人前出丑，闹笑话。与英文习语“make an exhibition of oneself”意思相近，表示“to behave so foolishly in public that one excites notice or ridicule”。

例句：

他在婚礼上喝醉了，在众人面前出了洋相。

He got drunk at the wedding and made an exhibition of himself in front of everyone.