 Waverly Theatre fans in New York are credited with the call back lines.Performance groups became a staple at "Rocky Horror" screenings due in large part to the prominent New York City fan cast.The cast was originally run by former schoolteacher and stand-up comic Sal Piro and by Dori Hartley, one of several performers in a flexible, rotating cast to portray the character of Frank N. Furter, shadowing the film above.