When the characters clinked glasses and exclaimed, “Toast!,” the audience threw toast. Now “Rocky Horror” will come to Broadway with an equally eclectic cast. Richard O’Brien wrote the show, but it was under the direction of the great rock and roll producer Lou Adler that “Rocky Horror” became a phenomenon. On stage the title is “The Rocky Horror Show,” also the word “Picture” — which was added for the movie — never goes away. The original Broadway version only had 49 performances.