It's always fun in Japanese when people flip conjugations by tacking nakunai on the end like you make a statement "akakunai" "it's not red" and they, disagreein

It's always fun in Japanese when people flip conjugations by tacking nakunai on the end like you make a statement "akakunai" "it's not red" and they, disagreeing with you in disbelief, fire back "akakunakunai?" Like "it ain't not red!" but it's phrased as a question intonation-wise. Japanese is a lot of fun.