make a fool of 出了洋相

A：I could kick myself, really.
B：What happened?
A：I made a fool of myself at the class meeting.
B：Oh, cheer up! Nobody will laugh at you.

A：我真想踢自己几下。
B：发生了什么事？
A：我在班会上出了洋相。
B：没什么！高兴点，没人会笑你的。