Don't interrupt Kiera Knightley on Broadway - USA TODAY

The social contract of going to the theater is pretty clear: you buy a ticket, take your seat. Turn your ringer off. Enjoy the show.

That basic etiquette was broken on Thursday night during the very first preview of Keira Knightley's Broadway debut. Debuting her new play, Thérèse Raquin, Keira was interrupted by a member of the audience.

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