Watch Some Like It Hot (the actress's very next movie after The Prince and the Showgirl) and listen for the acid in the back of her voice as she says "I always get the fuzzy end of the lollipop".
Or as an exasperated Billy Wilder said after “Some Like It Hot,” “Marilyn Monroe was never on time, never knew her lines.
After The Prince and the Showgirl Monroe went on to deliver her finest comedic performance in Billy Wilder’s masterpiece Some Like It Hot (1959) and her finest dramatic performance in John Huston’s The Misfits (1961) before dying in 1962 at the age of 36.
Going off the rails in its very first scene, showing its protagonist, Colin Clark (also the author of the memoirs on which the script is based), going to the pictures to see the iconic Marilyn Monroe, My Week with Marilyn's shotgun blast of first impressions includes a toothy, vaguely unpleasant spokesperson with a smile that looks like it hurts, a halfway decent impersonation of the Some Like It Hot legend, and a sense of what 1950s movies looked like that is so disastrously wrong, it adds a dimension of unintentional comedy all its own.
It's been a long time since I first saw Some Like It Hot, and this movie reminded me why audiences all over the world couldn't get enough of her.