[last lines]
Donald Duck: [after torturing his nephews with many cigars] Don't give up yet! Have another cigar...
[he stops seeing that he pulled out a card out of the empty cigar box]
Donald Duck: [reads it] 'To Uncle Donald'. Huh?
[opens the card and reads more]
Donald Duck: 'Happy Birthday. Huey, Dewey and Luey'. Birthday?
[suddenly goes horrified]
Donald Duck: Oh, my gosh!
[he looks at the 'Happy Birthday' card again from the box]
Donald Duck: No, no, no, no! Oh, what have I done!
[begins to shrink]
Donald Duck: It can't be true! What a horrible thing I've done to those boys!
[Donald continues yelling as he runs off through the hole of the treehouse]