We all know that Marilyn Monroe was an icon. In this shot, we see her in the movie "Seven Year Itch":

 

What you don't know is that Marilyn was constantly having to use stand-ins. She was late getting to rehearsals, late getting to filmings and never seemed to be around when the director needed her. The release of "Seven Year Itch" was dependant on one person who was willing to stand in for Marilyn during her 'down time'.

I'll just let this one speak for itself.