Subtitles. . MAKES "l DON' T KNOW" SC) ANDI. The "I don't know sound" is the same as saying "I don't know," using only vowels. yfw you realize you're now mumbling to yourself Subtitles MAKES "l DON' T KNOW" SC) ANDI The "I don't know sound" is the same as saying " using only vowels yfw you realize you're now mumbling to yourself