Mrs. Doubtfire
Leave it to Robin Williams to create something hilarious out of a design flaw. When he covers his face with icing, the production team didn't account for the hot studio lights melting the icing off of his face. So, when the sweet treat melts off his mask and into Mrs. Sellner's coffee cup, Robin cleverly improvised the line "There you go, you’ve got your cream and your sugar now.”
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