egg on one's face不是“蛋在某人脸上”，用来比喻犯了一些错误后看起来很愚蠢，意为“使显得愚蠢，出丑，丢脸”。

【例句】
Oh man, the boss found out that messed up the budget report, and now I have egg on my face.
天哪，老板发现预算报告搞砸了，现在我感觉很丢面子。

They were left with egg on their faces when only ten people showed up.
只有十人到场，他们感到很丢面子。