What happens if you forget to yell 'UNO' when you have one card left?
If you don't yell 'UNO' when you play your next-to-last card and you are caught before the next player begins their turn, you must draw two cards. You must yell 'UNO' to indicate that you have only one card left. (Page 1)
From the official Mattel GDR44 Uno Flip Card Game manual, page 1
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