Et tu, Siri?

A British theater-goer’s loud iPhone turned one of Shakespeare’s most famous tragedies into a comedy of errors.

After Edward Stone, playing Cassius in “Julius Caesar,’’ delivered the line, “Sirrah, what news?’’ Siri thought he meant her. “Sorry, I did not understand what you said,’’ Siri replied.

Some 500 people at the Bristol theater enjoyed what The Stage magazine recently called one of the most amusing moments of 2017.