Perry Mason moment

In court proceedings in the United States, a Perry Mason moment is said to have occurred whenever information is unexpectedly (to most present), and often dramatically, introduced into the record that changes the perception of the proceedings greatly and often influences the outcome. Often it takes the form of a witness's answer to a question, but it can sometimes come in the form of new evidence. It takes its name from Perry Mason, the popular mid-20th century television series where such dramatic reversals occurred, often in the form of witnesses confessing to crimes others were accused of in response to the sudden exposure of an inconsistency in their alibi. Such moments were frequent in the radio series and the original novels by Erle Stanley Gardner.