In Rockey Horror Picture Show how fo people know what to scream at the screen?

People who attend screenings of The Rocky Horror Picture Show often participate in a tradition called "call-outs" or "callbacks". During the movie, the audience shouts phrases and makes sound effects in response to specific moments on the screen. These call-outs are not scripted, but rather, they have developed over time as a form of audience participation. People who attend these screenings often learn the call-outs from friends, fellow attendees, or online resources, and it becomes part of the collective experience of watching the movie. Over the years, certain call-outs have become popular and widely recognized as part of the Rockey Horror tradition.