I looked down at all the forks and knives at the table and did not know what to do. I did not want to commit a .

A faux pas is a social mistake or breach of etiquette. Since the speaker is unsure how to use the forks and knives and wants to avoid doing something embarrassing at the table, “faux pas” fits. Déjà vu is the feeling that something has happened before, and avant-garde describes experimental or innovative ideas.

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