What couldn't Irene Dunne do?
Towards the end of the movie, when she shows up as Cary Grant's lush sister at his finacee's house, she puts on a little number for the family, and at one point tries to do some dance move but fails, sheepishly says, "I never could do that" and goes on singing. I read in an interview with Irene Dunne that it was something she herself couldn't do, so she ad-libbed the line, but I never have figured out what it was that she was supposed to do there. Does anyone know what she was referring to?
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