 Shirley Jones (I) (qv) learned she was pregnant with her son  Patrick once the filming of The Music Man had begun. She met with  the director over lunch to tell him of the situation. Her concern  was that she would begin "showing" during its filming. He assured  her that they could work through it with costumes and also by  filming her from the waist up, if necessary. He did have one  request, however: That she tell no one about it.  Robert Preston (I) (qv) did figure it out before filming had  concluded, however, when Shirleys character, Marion, and his  character, Professor Hill, kissed for the first time in the romantic  footbridge scene. He leaned in for the kiss and jumped back, asking  her, "What was that?" to which she replied, "That is Patrick  Cassidy! Say, Hello!" Years later, her son Patrick had the  opportunity to meet Robert Preston. He walked up and introduced  himself saying, "Hello. Im Patrick Cassidy (I) (qv)." Robert  Preston replied, "Yes, I know. Weve already met!"