Myrna was a waitress at Statler's Cafe. She was very focused on her duties and became sarcastic and rude to Mary Loomis and Norman Bates when she found they weren't working fast enough for her tastes (Psycho II).
After the disappearance of Emma Spool, Myrna became the principle waitress at the cafe. She was somewhat offended when Ralph Statler told Tracy Venable that Spool was the best waitress he'd ever had (Psycho III).
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With Norman in Psycho III